CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
December 5, 2017
Peter Martz
Arroya Investments, LLC
P.O. Box 50223
Colorado Springs, CO 80949
CORE Consultants Project Number 16-059
Re: Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
El Paso County, Colorado
Dear Mr. Martz:
CORE Consultants, Inc. (CORE) presents this memo summarizing an impact identification report of the
proposed The Retreat at Timber Ridge Residential Development Project (Project) in El Paso County, Colorado.
The memo tiers to the requirements set-forth in the Wildlife Impact Identification Report Checklist created
by El Paso County. The report is required as part of a County submittal application for a Planned Unit
Development (PUD). The Project is located adjacent to and surrounding the intersection of Vollmer Road and
Arroya Lane and is on the U.S. Geological Survey (USGS) Falcon North West 7.5-minute quadrangle, on
portions of Sections 21, 22, 27, and 28 in Township 12 South, Range 65 West (Attachment 1: Site Location
Map). The Project would consist of the construction of single family residential homes, permanent access roads,
and associated facilities.
CORE completed a desktop review and subsequent site reconnaissance and wetland delineation of the
Project for the following natural resources and potential biological constraints:
• Significant topographic features;
• Potentially jurisdictional water features and floodplains;
• Potential for occurrence of federally-listed threatened and endangered species (TES) and their
associated habitats;
• Federally-designated Critical Habitat for TES; and
• Potential for occurrence of state threatened (ST), state endangered (SE), state species of concern
(SC), and their associated habitats, and big game migratory routes and species specific
concentration areas.
• Potential geologic hazards
• Potential wildfire hazards
Publicly-available data sources reviewed via desktop included the U.S. Fish and Wildlife Service’s (USFWS)
Information Planning and Conservation (IPaC) System, the USFWS Critical Habitat Portal, species profiles and
spatial data from Colorado Parks and Wildlife (CPW), the USFWS National Wetland Inventory (NWI), the
U.S. Geological Survey (USGS) National Hydrography Dataset (NHD), Federal Emergency Management Agency
(FEMA) Flood Insurance Rate Maps (FIRM), USGS aerial imagery, El Paso County Wildfire Hazard Map, and El
Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
December 5, 2017
Page 2 of 12
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
Paso County Soil Survey data (NRCS 1981). A site reconnaissance was conducted on December 15, 2016 to
field-verify results of the desktop review. A routine wetland delineation was conducted on May 15 and 16,
2017, during the growing season.
ENVIRONMENTAL SETTING
The Project lies within the Fountain watershed, referenced as 8-digit Hydrologic Unit Code (HUC) 11020003.
Topography of the Project consists of rolling foothill grasslands within the southern portion of the Project
transitioning into pine/oak woodlands within the northern portion of the Project (Chapman et al. 2006).
Scattered, shallow ridges and dense stands of ponderosa pine (Pinus ponderosa) are located across the northern
portion of the Project and coincide with the southern boundary of Black Forest. Sand Creek and multiple
unnamed tributaries drain the Project in a southerly direction; the confluence of two unnamed tributaries
converge at the main channel of Sand Creek within the northern portion of the Project. Project elevations
range between approximately 7,150 and 7,400 feet above mean sea level (AMSL). Land use in the region is
typified by rangeland grazing with increasing urban and residential development.
Dominant species within the foothills grasslands include little bluestem (Schizachyrium scoparium), big bluestem
(Andropogon gerardii), switch grass (Panicum virgatum), and yellow Indiangrass (Sorghastrum nutans). Scattered
pine-oak communities are located across higher elevation areas of the foothills grasslands. Ponderosa pine and
Gambel oak (Quercus gambelii) dominate the canopy and understory of the pine-oak woodlands. Mountain
mahogany (Cercocarpus montanus), skunkbush (Rhus trilobata), western serviceberry (Amelanchier alnifolia), and
chokecherry (Prunus virginiana) are also found scattered throughout the understory.
Wetlands and Waters of the U.S.
The USFWS NWI and USGS NHD datasets were reviewed for the presence of potentially jurisdictional Waters
of the U.S. (WOUS) within the Project. Aerial imagery was reviewed to locate water features not included
within the NWI and NHD datasets. Spatial data indicates that the main channel of Sand Creek and unnamed
tributaries drain the Project in a southerly direction (Attachment II: National Wetland Inventory Map). NWI
maps depict two palustrine, unconsolidated bottom, semipermanently flooded wetlands (PUBF) within the
Project (Attachment II). NHD datasets depict four NHD waterbodies characterized as lakes/ponds, two of
which coincide with the NWI identified wetlands (Attachment II). Aerial imagery interpretation indicates
that the main channel of Sand Creek is perennial throughout much of its stretch within the Project; erosion
and incision of the main channel is apparent throughout the southern portion of the main channel. Aerial
interpretation of the northern portion of the Project indicates channelization of the unnamed tributaries and
main channel of Sand Creek, and that extensive emergent wetlands are likely present within and adjacent to
the channels. A site reconnaissance and a routine wetland delineation were deemed necessary to confirm
desktop findings.
FEMA Zone-A Floodplains
The Project is located within the boundaries of FEMA FIRM panel 08041C0535F El Paso County (FEMA 1997).
Zone-A floodplains are mapped within and adjacent to the main channel of Sand Creek, south of Arroya Lane
(Attachment III: FEMA FIRM Panel). Zone-A floodplains (also referred to as 100-year floodplains) are defined
as those areas subject to an annual 1% chance of flooding.
Federal TES
The USFWS IPaC database (USFWS 2017a) was used to determine the likelihood of occurrence for federally
listed TES within the Project. The IPaC query listed four species, including one bird, one flowering plant, one
Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
December 5, 2017
Page 3 of 12
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
mammal, and one fish, as having the potential to occur within the Project. An additional five species were listed
to be considered under a conditional effects analysis; i.e., and additional five species would be considered if the
Project would affect water within the South Platte River watershed (Table 1).
Table 1. TES LIKELIHOOD OF OCCURRENCE WITHIN THE PROJECT (USFWS 2017a)
FE=Federally Endangered; FT=Federally Threatened; ST=State Threatened
Preble’s Meadow Jumping Mouse
Preble’s meadow jumping mouse (Zapus hudsonius preblei; PMJM) is a federally threatened species and is a state
threatened species in Colorado. PMJM occur along the Front Range of the Rocky Mountains throughout several
counties in Wyoming and Colorado. Preferred habitat includes well developed riparian corridors with gentle
COMMON NAME SCIENTIFIC
NAME
STATUS LIKELIHOOD OF OCCURENCE
Complete Effects Analysis
Greenback cutthroat trout Oncorhynchus clarkii
stomias
FT Unlikely: historically occupied steep, cold, high
mountain streams and rivers in the South Platte
and Arkansas River watersheds (Young 2009). A
single, genetically pure population remains in
Bear Creek, El Paso County (Martin et al. 2015).
Mexican spotted owl Strix occidentalis lucida FT Unlikely: requires mixed-conifer stands and
narrow canyons (Gutiérrez et al. 1995).
Designated critical habitat is > 10 miles from
Project; lack of habitat connectivity.
Preble’s meadow jumping
mouse
Zapus hudsonius
preblei
FT, ST Low potential: see discussion below.
Ute ladies’-tresses Spiranthes diluvialis FT Unlikely: see discussion below
Conditional Effects Analysis
Least tern
Sternula antillarum
(interior population)
FE Project is located outside of species’ range;
Project would not affect water within the S.
Platte River watershed. Therefore, impacts to
this species would not occur.
Pallid sturgeon Scaphirynchus albus
(entire population)
FE Project is located outside of species’ range;
Project would not affect water within the S.
Platte River watershed. Therefore, impacts to
this species would not occur.
Piping plover Charadrius melodus
(except Great
Lakes watershed)
FT Project is located outside of species’ range;
Project would not affect water within the S.
Platte River watershed. Therefore, impacts to
this species would not occur.
Western prairie fringed
orchid
Platanthera praeclara FT Project is located outside of species’ range;
Project would not affect water within the S.
Platte River watershed. Therefore, impacts to
this species would not occur.
Whooping crane Grus americana FE Project is located outside of species’ range;
Project would not affect water within the S.
Platte River watershed. Therefore, impacts to
this species would not occur.
Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
December 5, 2017
Page 4 of 12
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
slopes and adjacent grasslands that allow for movement in and out of the stream channel. Their population has
declined due to habitat fragmentation and degradation resulting from urban development in riparian areas
(USFWS 2004). Critical habitat was designated for PMJM across its range in 2003 (68 FR 37275). USFWS
designated critical habitat zones are those areas that scientifically and biologically support reproduction,
foraging, hibernation, rearing young, and dispersal. CPW designated PMJM occupied ranges are those areas
within one mile of CPW known occurrences (CPW 2014). The closest USFWS critical habitat and CPW
occupied range is located approximately six and four miles, respectively, northwest along the Black Squirrel
Creek drainage.
The USFWS has determined block clearance zones as those areas where PMJM is unlikely to occur as a result
of habitat fragmentation or consistently negative trapping results. The stretch of Sand Creek within the Project
is located within the northernmost portion of the USFWS PMJM Block Clearance Zone for the Colorado
Springs Area (USFWS 2010). A site reconnaissance was deemed necessary to more accurately assess the
potential for the presence of PMJM habitat within the Project.
Ute Ladies’-tresses Orchid
Ute ladies’-tresses orchid (ULTO) is a perennial orchid listed as federally threatened. This forb has ivory
flower clusters arranged in a spike growing approximately 8-20 inches tall. ULTO is known to occur in parts
of Colorado, Wyoming, Idaho, Montana, Nebraska, Utah, and Washington. The plant typically occurs within
features associated with major river floodplains including riparian edges, gravel bars, old oxbows, high flow
channels, and moist to wet meadows associated with perennial streams; it is found under 6,500 feet AMSL in
Colorado (USFWS 2014). Surveys have indicated that the species may also inhabit groundwater-fed springs
or sub-irrigated meadows, seeps, and human-influenced riparian habitats that receive reliable and stable spring
inundation (Fertig et al. 2005; NRCS 2009). Soils in areas of suitable habitat have a high micronutrient and
organic matter content and display gley features when sampled (NRCS 2009).
A review of spatial data and aerial imagery indicates that the Project is not located at elevations appropriate
to sustain ULTO within Colorado. It is not anticipated that Project development would impact ULTO or its
associated habitat.
Migratory Birds
The USFWS IPaC database (USFWS 2017a) was used to determine the potential for occurrence of migratory
birds within the Project that are protected under the Migratory Bird Treaty Act (MBTA) of 1918 (16 U.S.C.
§§ 703–712). The IPaC query listed 24 migratory bird species, including 16 potential breeding species, seven
potential year-round resident species, and one potential wintering species. Breeding migratory birds, and the
parts, nests, or eggs of such a bird receive statutory protection under the MBTA, and disturbing such species
(defined at 16 U.S.C. §§ 703–712) is prohibited.
CPW Species Activity Mapping: El Paso County
The CPW SAM spatial data were reviewed to determine the potential for the occurrence of general wildlife,
including big game species. The review indicated that there is potential for the occurrence of five mammals
and 13 reptiles (Table 2).
Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
December 5, 2017
Page 5 of 12
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
Table 2. General Wildlife Potential for Occurrence (CPW 2017)
General wildlife do not receive statutory protection, and the Project area does not intersect with big game
migratory routes. The closest migratory route is utilized by elk (Cervus canadensis) and is located approximately
11 miles north of the Project. The Project does intersect with a seasonal fall concentration area for black bears
(Ursus americanus), as well as the peripheral range for mountain lion (Puma concolor) in the northern, small
forested portions of the Project. Development of residential property has the potential to attract black bear,
since trash would be readily available for forage. A site reconnaissance would determine the potential for
occurrence of specific general wildlife species.
Geologic Hazards Review
The El Paso County Soil Survey data were reviewed to determine the potential for the presence of geologic
hazards within the Project. The NRCS provides information on soils properties that would influence the
development of building sites, including the selection of the site, the design of the structure, construction,
performance after construction, and maintenance. Quantitative soil ratings are assigned to each major soil
group and include ‘Not limited’, ‘Somewhat limited’, and ‘Very limited’. ‘Not limited’ indicates that the soil type
has properties that are very favorable for the specified type of construction. ‘Somewhat limited’ indicates that
the soil type has properties that are moderately favorable for the specified type of construction. These
COMMON NAME SCIENTIFIC NAME TYPE OF OCCURENCE (CPW 2017)
Mammals
Abert’s squirrel Sciurus aberti Overall range (north of Wildflower Road)
Black bear Ursus americanus Fall concentration area
Mountain lion Puma concolor Peripheral range
Mule deer Odocoileus hemionus Overall range
Pronghorn antelope Antilocapra americana Overall range (south of Wildflower Road)
Reptiles
Bullsnake Pituophis catenifer sayi Overall range
Common lesser earless lizard Holbrookia maculata Overall range
Hernandez’s short-horned lizard Phrynosoma hernandesi
hernandesi
Overall range
Many-lined skink Plestiodon multivirgatus Overall range
Milk snake Lampropeltis triangulum Overall range
Ornate box turtle Terrapene ornata ornata Overall range
Painted turtle Chrysemys picta Overall range
Plains garter snake Thamnophis radix Overall range
Prairie lizard Scleroporus undulatus Overall range
Prairie rattlesnake Crotalus viridis Overall range
Six-lined racerunner Aspidoscelis sexlineata Overall range
Smooth green snake Opheodrys vernalis Overall range
Terrestrial garter snake Thamnophis elegans Overall range
Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
December 5, 2017
Page 6 of 12
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
limitations can generally be overcome through planning and design considerations. ‘Very limited’ indicates that
the soil type has properties that cannot generally be overcome through design and planning considerations
(NRCS 2017). County soil survey data indicate that the Project is composed of Columbine gravelly sandy loams
(0 to 3 percent slopes), Kettle gravelly loamy sand (3 to 8 percent slopes and 8 to 40 percent slopes), and
Pring coarse sandy loams (3 to 8 percent slopes) (NRCS 2017) (Attachment IV: County Soil Survey Map). The
review of data indicated that the Project soils are rated ‘Not limited’ for the construction of dwellings with or
without basements, with the exception of Kettle gravelly sandy loams (8 to 40 percent slopes). This soil series
comprises a small, forested area of the northwestern corner of the Project, west of Vollmer Road and a very
small area within the northeastern corner of the Project (Attachment IV).
Wildfire Hazards Review
El Paso County Wildfire Hazards Based on CVCP Indicators Map was reviewed to determine the potential wildfire
hazard levels within the Project. The County assigns a rating of ‘High Hazard’ or ‘No Hazard’ based on type of
vegetation cover. Forested areas are considered ‘High Hazard’ and grass/shrub areas are considered “Low
Hazard’. A review of the map indicated that the majority of the Project is considered ‘Low Hazard’ for wildfire
threat (El Paso County 2007). A ‘High Hazard’ and “Low Hazard’ rating is interspersed across the northern
portion of the Project since this area represents the transition zone between the foothill-grasslands and the
pine-oak woodlands (El Paso County 2007).
SITE RECONNAISSANCE
A site reconnaissance of the Project was conducted on December 15, 2016. A routine wetland delineation
was conducted on May 15 and 16, 2017. The site visits confirmed the majority of the initial results of the
desktop review.
Vegetation
Dominant vegetation consisted of plants typical of the foothill grasslands and pine-oak woodlands; vegetation
was relatively undisturbed. Native species observed included blue grama (Bouteloua gracilis), needle-and-thread
(Hesperotipa comata), yellow Indiangrass, fringed sage (Artemesia frigida), blackbent (Agrostis gigantea), and
buckwheats (Polygonum spp.). Shrubby and tree species observed included peach leaf willow (Salix
amygdaloides), coyote willow (Salix exigua), narrowleaf cottonwood (Populus angustifolia), and ponderosa pine.
Noxious weed species observed included common mullein (Verbascum thapsus), and diffuse knapweed
(Centaurea diffusa). El Paso County requires that noxious weed populations be treated prior to construction
on projects requiring ground disturbance (El Paso County 2014).
PMJM
The site reconnaissance confirmed the initial results of the desktop review regarding the low potential for
the presence of PMJM within or in the vicinity of the Project. Sand Creek presented as a steeply incised and
eroded channel throughout the majority of the southern portion of the Project. Short stretches of the
southernmost portion of the channel are widely eroded such that some disperse, riparian vegetation has
established within the banks adjacent to the channel within the area of incision. A short stretch of Sand Creek
south of Arroya Lane presented as a perennial stream with gently sloping banks and well developed riparian
canopy coverage. However, this stretch is located within the USFWS PMJM block clearance zone for the
Colorado Springs area (USFWS 2010) (Attachment V: Habitat Assessment Map).
It is CORE’s opinion that the Project would not impact PMJM or its associated habitat. Sand Creek and its
unnamed tributaries are not included in designated Critical Habitat for PMJM, nor in CPW’s PMJM occupied
Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
December 5, 2017
Page 7 of 12
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
range (USFWS 2017b, CPW 2014). Further, portions of the main channel of Sand Creek that presented as
characteristically suitable PMJM habitat south of Arroya Lane are minimal and are located within the USFWS
PMJM block clearance zone for the Colorado Springs Area (USFWS 2010).
Since the initial submittal of this report, the Applicant has corresponded with the USFWS regarding the
Project’s potential to impact federally threatened and endangered species (Attachment VI: Agency
Correspondence). In their response, the USFWS determined that “it seems unlikely that the Project will result
in take of listed species, but the Project may have minor adverse impacts to listed species that may occur in or
near the Project area.” Since the USFWS will not provide site-specific conservation recommendations, they
provide a list of localized conservation recommendations that could be utilized prior to, during, and post-
construction (Attachment VI). The Applicant has committed to following the local conservation
recommendations set forth by the USFWS to the greatest extent possible.
Migratory Birds
Suitable substrates for nesting raptors were present in the form of mature narrowleaf cottonwoods and
ponderosa pines, widely distributed adjacent to and within the Sand Creek channel and across the northern
portion of the Project. Raptor nests were observed within the southern portion of the Project along Sand
Creek (Attachment V). A nesting raptor survey during the breeding season (February 1 through July 15)
would confirm the presence or absence of active raptor nests within the Project (CPW 2008).
CPW Species Activity Mapping
The site reconnaissance determined a high probability for several general wildlife species identified during the
desktop review of CPW SAM data (CPW 2017). Abert’s squirrel, black bear, and mountain lion have some
potential to occur within the forested areas in the northern portion of the Project. Development of the
Project has the potential to attract black bears, since trash would be readily available for forage. Mule deer
have the potential to occur within the forested areas in the northern portion of the Project. There is potential
for pronghorn to occur within the southern portion of the Project; however, development has greatly
fragmented suitable habitat in the Project vicinity. As such, development may create a barrier through which
pronghorn cannot disperse from habitat further east of the Project. The Project provides suitable habitat for
general reptile species identified during the desktop review of CPW SAM data. There is the potential for
occurrence of other general wildlife including avian and amphibian species. CPW SAM data does not include
amphibians (CPW 2017).
Since the initial submittal of this report, CPW has provided general conservation recommendations that
would conserve Project habitat that could potentially support deer, elk, pronghorn, turkey, black bear,
mountain lion, coyote, fox, raptors, songbirds, and numerous small mammals (Attachment VI: Agency
Correspondence). The Applicant has committed to following these recommendations to the greatest extent
possible.
WOUS
CORE performed a routine wetland delineation of the Project on May 15 and 16, 2017 (Attachment VII:
Wetland Delineation Report). Potentially jurisdictional aquatic features were delineated on-site. Observations of
hydric soils, wetland vegetation, and hydrology aided in CORE’s determination of the potential regulatory status
of Waters of the U.S. (WOUS), within the Project. Based on the routine wetland delineation and document
review, CORE identified eight potentially jurisdictional wetlands, four jurisdictional (JD) channels, and four
isolated wetlands on the Project (Attachment VII).
Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
December 5, 2017
Page 8 of 12
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
It is anticipated that permanent impacts to WOUS would result from development of the Project. When
impacts to jurisdictional wetlands exceed 0.1 acre, compensatory mitigation is required at a 1:1 ratio pursuant
to Section 404 of the Clean Water Act. (CWA). Further, projects that result in the loss of greater than 300
linear feet of jurisdictional channels and/or 0.5 acres of jurisdictional wetlands and/or streambed require an
Individual Permit (IP) pursuant to Section 404 of the CWA. It is anticipated that development of the Project
would result in the permanent loss of jurisdictional aquatic features in excess of 300 linear feet and 0.5 acre.
As such, CORE requested a site visit with the Albuquerque District of the U.S. Army Corps of Engineers
(USACE) to confirm the wetland delineation conducted by CORE on May 15 and 16, 2017, review potential
impacts to WOUS resulting from development of the Project, and identify and discuss potential areas for
wetland mitigation within the Project (Attachment VIII: Preliminary Impacts to WOUS Map). At the June 29,
2017 site visit with USACE personnel, the USACE advised CORE to submit a request for a Determination of
Department of the Army Permit Requirements as a means for formalizing the USACE’s preliminary
jurisdictional determination (pre-JD) and acknowledgement of CORE’s wetland delineation. Additionally,
CORE and the USACE identified multiple sites within the Project that would satisfy the conditions required
for the successful establishment of mitigation wetlands. Following the site visit, CORE received a determination
of Department of the Army permit requirements from the Albuquerque District (Attachment IX:
Determination of Department of the Army Permit Requirements for – The Retreat at Timber Ridge Residential
Development). Based on the preliminary design, the USACE determined that an IP may be required for the
Project.
CULTURAL RESOURCES
CORE contracted Cultural Resource Analysts, Inc. (CRA) to conduct a desktop records review and assessment
of cultural resources within and in the vicinity of the Project (Attachment X: Class I Cultural Resources Review).
An official file search was conducted using the records housed with the Colorado Historical Society’s Office of
Archaeology and Historic Preservation (OAHP). The file search listed one previous investigation near the
Project that occurred in 2002;this review indicated that no cultural resource sites have been previously
identified within or near the current project area. No Class III pedestrian surveys have been conducted within
or adjacent to the Project; a future survey could be required by the USACE as part of the Section 404 permitting
process.
CONCLUSIONS AND RECOMMENDATIONS
The site reconnaissance indicated some biological constraints within the Project. Residential development has
the potential to attract black bears. Appropriately containing trash would mitigate this potential constraint.
Suitable nesting raptor substrates were present within the Project in the form of mature cottonwoods and
pine trees widely distributed along the Sand Creek drainage, and dense stands of mature pine trees across the
northern portion of the Project. The IPaC query determined the potential for the presence of multiple
migratory breeding bird species within the Project. Nesting raptors and nesting migratory avian species are
protected under the MBTA (16 U.S.C. §§ 703–712). WOUS are present within and adjacent to Sand Creek
and its unnamed tributaries within the Project based on a routine wetland delineation and determination of
Department of the Army permit requirements. Impacts to jurisdictional waters would trigger permitting under
Section 404 of the Clean Water Act (CWA). The determination of Department of the Army permit
requirements indicated that an IP may be required based on preliminary design. The records review and
assessment of cultural resources did not indicate the presence of cultural resource sites within the Project.
There is potential that the USACE, through consultation with the OAHP, could require a Class III pedestrian
survey for cultural resources within the Project. Noxious weed populations were detected during the survey.
Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
December 5, 2017
Page 9 of 12
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
The Applicant should treat and manage noxious weed populations based on a Project-specific noxious weed
management plan. Based on agency correspondence, CORE recommends the following:
• Perform raptor nest surveys prior to the start of construction to identify active raptor nest locations.
If construction is to occur during the raptor nesting season (February 1 through July 15), CORE
recommends that surveys be conducted prior to construction activities and buffers be established
around active raptor nests, in accordance with the guidance in CPW Recommended Buffer Zones and
Seasonal Restrictions for Colorado Raptors (CPW 2008). It is recommended that construction activities
be performed outside of the raptor nesting season.
• Conduct breeding bird surveys prior to the start of construction but during the breeding bird season
to identify active breeding bird nests. If construction is to occur during the breeding bird season (March
15 through July 31), CORE recommends that surveys be conducted prior to any grading or grubbing
activities that would impact ground-nesting or tree-nesting migratory bird species. Any active nests
identified during surveys should be flagged and avoided until a qualified biologist determines the nest is
no longer active. Doing so would satisfy provisions listed under the MBTA (16 U.S.C. §§ 703–712). It
is recommended that construction activities be performed outside the breeding bird nesting season.
• Perform noxious weed surveys and subsequent treatments prior to ground disturbing activities per the
El Paso County Weed Management Plan (El Paso County 2014). All disturbed areas should be re-
vegetated with a native seed mix at the completion of construction (Attachment XI: Noxious Weed
Management Plan).
• Drainages should be crossed at areas that would result in the lowest impact to riparian habitat.
Specifically, drainages would be crossed perpendicular to the flow of the stream and at locations that
would cause the least erosion of banks and sedimentation; crossings should avoid mature trees that
may provide suitable nest habitat to the greatest extent possible.
• Grounds should be surveyed for active fox dens prior to ground disturbance. Should an active fox den
be identified, the path of construction would be modified to avoid disturbance of the active den.
If you have any questions, concerns or require additional information, please feel free to contact me at
303.703.4444 or by email at [email protected].
Sincerely,
CORE Consultants, Inc.
Tina Brazil
Environmental Consultant
Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
December 5, 2017
Page 10 of 12
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
LIST OF ATTACHMENTS ATTACHMENT I: SITE LOCATION MAP
ATTACHMENT II: NATIONAL WETLAND INVENTORY MAP
ATTACHMENT III: FEMA FIRM PANEL
ATTACHMENT IV: COUNTY SOIL SURVEY MAP
ATTACHMENT V: HABITAT ASSESSMENT MAP
ATTACHMENT VI: AGENCY CORRESPONDENCE
ATTACHMENT VII: WETLAND DELINEATION REPORT
ATTACHMENT VIII: PRELIMINARY IMPACTS TO WOUS MAP
ATTACHMENT IX: DETERMINATION OF DEPARTMENT OF THE ARMY PERMIT REQUIREMENTS FOR – THE RETREAT AT
TIMBER RIDGE RESIDENTIAL DEVELOPMENT
ATTACHMENT X: CLASS I CULTURAL RESOURCES REVIEW
ATTACHMENT XI: NOXIOUS WEED MANAGEMENT PLAN
Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
December 5, 2017
Page 11 of 12
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
REFERENCES
Chapman, S.S., G.E. Griffith, J.M. Omernik, A.B. Price, J. Freeouf, and D.L. Schrupp. 2006. Ecoregions of
Colorado (color poster with map, descriptive text, summary tables, and photographs): Reston,
Virginia, U.S. Geological Survey (map scale 1:1,950,000).
_____. 2017. Colorado Parks and Wildlife (CPW). CPW Species Activity Mapping Data. Updated February
2017. Available for download at:
https://www.arcgis.com/home/item.html?id=190573c5aba643a0bc058e6f7f0510b7
_____. 2014. CPW PMJM Occupied Range. Spatial Data. Available for download at
http://www.arcgis.com/home/item.html?id=dac6d46d709945f3ad8d03afd70b58b1.
. 2008. Recommended Buffer Zones and Seasonal Restrictions for Colorado Raptors. Available online
at https://cpw.state.co.us/Documents/WildlifeSpecies/LivingWithWildlife/
RaptorBufferGuidelines2008.pdf.
El Paso County. Noxious Weed Management Plan. 2014. Available online at
http://adm.elpasoco.com/Environmental%20Division/Forestry%20and%20Noxious%20Weeds/Docum
ents/14-097.pdf
. 2007. Wildfire Hazards Based on CVCP Indicators. Available online at
http://adm.elpasoco.com/Development%20Services/Documents/All%20Maps/FireHazards.pdf
Federal Emergency Management Agency. 1997. El Paso County, Colorado FEMA Flood Insurance Rate Maps.
Map 08041C0535F.
Fertig, W., R. Black, and P. Wolken. 2005. Rangewide Status Review of Ute’s Ladies’- Tresses (Sprianthes
diluvialis). Available online at https://www.fws.gov/mountain-prairie/species/
plants/uteladiestress/spdi_status%20review_fertig2005.pdf.
Gutiérrez, R.J., A.B. Franklin and W.S. Lahaye. 1995. Spotted Owl (Strix occidentalis), The Birds of North
America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York, NY, USA. Available
online at http://bna.birds.cornell.edu/bna/species/179.
Martin, A., J. Metcalf, C. Kennedy, and K. Rigers. 2015. Comparison Between Modern and Historical
Distribution and Diversity of Cutthroat Trout in Colorado. Abstract from American Fisheries Society
145th Annual Meeting.
Natural Resources Conservation Service (NRCS). 2017. Building Site Development: Dwellings and Small
Commerical Buildings Report. Available online at:
https://websoilsurvey.sc.egov.usda.gov/App/WebSoilSurvey.aspx
. 2009. Ute Ladies’-Tresses (Spiranthes diluvialis) Plant Guide. Available online at
https://plants.usda.gov/plantguide/pdf/pg_spdi6.pdf
. 1981. El Paso County Soil Survey.
Impact Identification Report
The Retreat at Timber Ridge Residential Development Project
December 5, 2017
Page 12 of 12
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
U.S. Army Corps of Engineers. 1987. Wetlands Delineation Manual.
U.S. Fish and Wildlife Service. 2017a. Information for Planning and Conservation Online System. Available
online at https://ecos.fws.gov/ipac/.
________.2017b. Critical Habitat Portal. Available online at http://ecos.fws.gov/tess_public/profile/
speciesProfile?spcode=E00F. Accessed December 2016.
. 2014. Species Profile for Ute ladies’-tresses (Spiranthes diluvialis). Available online at
https://ecos.fws.gov/ecp0/profile/speciesProfile?spcode=Q2WA.
. 2010. Preble’s Meadow Jumping Mouse Block Clearance Map for the Colorado Springs Area.
Available online at https://www.fws.gov/mountain-prairie/species/mammals/preble/
BLOCK_CLEARANCE/11-23-2010_USFWS_Prebles_Block_Clearance_Map_for_the_
Denver_Metro_Area.pdf.
. 2004. Preble’s Meadow Jumping Mouse (Zapus hudsonius preblei) Survey Guidelines. Available online
at http://www.fws.gov/mountainprairie/species/mammals/preble/
CONSULTANTS/pmjm2004guidelines.pdf.
Young, M.K. 2009. Greenback Cutthroat Trout (Oncorhynchus clarkii stomias): a technical conservation
assessment. USDA Forest Service, Rocky Mountain Region. [Online.] Available at
http://www.fs.fed.us/r2/projects/scp/assessments/greenbackcutthroattrout.pdf. Accessed January
2016.
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
ATTACHMENT I
S ITE LOCATION MAP
Retreat at Timber RidgeSite Location Map
El Paso County, Colorado
0 2,000 4,000Feet
q
Project Boundary
UT
KS
NM
NE
WY
OKAZ
Project Area
Colorado Vicinity
Reference:USGS 7.5 Minute
Topographic QuadrangleFalcon NW, CO Quad
Date: 12/5/2017CORE Project #: 16-059
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
ATTACHMENT II
NATIONAL WETLAND INVENTORY MAP
11020004Chico
11020003Fountain
Glenside Dr
Kiln
inve
r C
t
Wa
ke
ly R
dR
ocki L
n
Kurie
Rd
Salbeck Ln
Flaming Sun Dr
Toltec Ln
Wildflower Rd
Millard Way
Tobin Rd
Pine Park Trl
Bennison Ter
Arr
oya
Ln
Shipman Ln
Pin
e M
ea
do
ws
Rd
McFerran Rd
Poco Rd
Stapleton Dr Stapleton Rd
Th
om
as
RdHu
ng
ate
Rd
To
ma
ha
wk T
rl
Hu
nts
ma
n R
d
Vollm
er
Rd
Ra
yg
or
Rd
Date: 12/5/2017
CORE Project #: 16-059
The Retreat at Timber RidgeNational Wetland Inventory Map
El Paso County, Colorado
0 1,000 2,000Feet
q
Project Boundary
NHD Watercourse
NHD Waterbody
NWI Wetland
USGS Watershed
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
ATTACHMENT III
FEMA FIRM PANEL
FIRM Panel08041C0535G
Flaming Sun Dr
Glenside Dr
Old Settlers Trl
Wildflower Rd
Millard Way
Arroya Ln
Poco Rd
Vollm
er
Rd
To
ma
ha
wk T
rl
Hu
nts
ma
n R
d
Date: 12/6/2017
CORE Project #: 16-059
The Retreat at Timber RidgeFEMA FIRM Panel
El Paso County, Colorado
0 1,000 2,000Feet
q
Project Boundary
NHD Watercourse
Revised Floodplain (LOMR)
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
ATTACHMENT IV
COUNTY SOIL SURVEY MAP
Salbeck Ln
Glenside Dr
Old Settlers Trl
Flaming Sun Dr
Shipman LnToltec Ln
Wildflower Rd
Millard WayBe
nn
iso
n T
er
Arroya Ln
Poco Rd
Th
om
as
Rd
Vollm
er
Rd
To
ma
ha
wk T
rl
Hu
nts
ma
n R
d
Ra
yg
or
Rd
19
71
71
41
41
41
4171
71
71
40
4040
19
The Retreat at Timber RidgeCounty Soil Survey Map
El Paso County, Colorado
0 1,000 2,000Feet
q
Project Boundary
NHD Watercourse
Soil
Map Symbol Soil Name19 Columbine gravelly sandy loam, 0 to 3 percent slopes40 Kettle gravelly loamy sand, 3 to 8 percent slopes41 Kettle gravelly loamy sand, 8 to 40 percent slopes71 Pring coarse sandy loam, 3 to 8 percent slopes
El Paso County Soil Survey
Date: 12/5/2017
CORE Project #: 16-059
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
ATTACHMENT V
HABITAT ASSESSMENT MAP
Pine Meadows Rd
Poco Rd
Wildflower Rd
Arroya Ln
Vollm
er
Rd
Date: 12/6/2017
CORE Project #: 16-059
Trails at Timber RidgePMJM Habitat Assessment Map
El Paso County, Colorado
q
0 1,000 2,000Feet
Project Boundary
Proposed Road
Proposed Lot
NHD Watercourse
NHD Waterbody
NWI Wetland
Colorado Springs PMJM BlockClearance
Revised Floodplain (LOMR)
Observed Raptor Nest
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
ATTACHMENT VI
AGENCY CORRESPONDENCE
United States Department of the Interior
FISH AND WILDLIFE SERVICE Colorado Ecological Services Field Office
P.O. BOX 25486, Denver Federal Center, Mail Stop 65412
Denver, Colorado 80225-0486
Attachment – Conservation Recommendations
Preble’s Meadow Jumping Mouse (Zapus hudsonius preblei), Ute Ladies’-tresses Orchid
(Spiranthes diluvialis), Colorado butterfly plant (Oenothera coloradensis)
PRE-CONSTRUCTION DESIGN: 1. Design the project to avoid and minimize the permanent and temporary impacts to riparian and
adjacent upland habitats.
a. Before construction, identify and prioritize riparian and adjacent upland habitats within
the project area. Design the project so that it avoids these habitats whenever possible.
b. Minimize the amount of concrete, riprap, bridge footings, and other “hard,”
impermeable engineering features within the stream channel and riparian or adjacent
upland habitats.
c. Use bioengineering techniques to stabilize stream banks.
d. Minimize the number and footprint of access routes, staging areas, and work areas.
e. Locate access routes, staging areas, and work areas within previously disturbed or
modified non-habitat areas.
f. Maintain habitat connectivity under bridges or through culverts by installing ledges or
dry culverts adjacent to the culverts with water flow.
g. Avoid fragmenting linear riparian corridors.
2. Install limits of work fencing (e.g., orange barrier netting or silt fencing), signage, or other
visible markers to delineate access routes and the project area from habitats. Use this fencing to
enforce no-entry zones.
3. Hold a preconstruction briefing for onsite personnel to explain the limits of work and other
conservation measures.
4. Follow regional storm water guidelines and design best management practices (BMPs) to
control contamination, erosion, and sedimentation, such as silt fences, silt basins, gravel bags,
and other controls needed to stabilize soils in denuded or graded areas, during and after
construction.
5. Locate utilities along existing road corridors, and if possible, within the roadway or road
shoulder.
a. Bury overhead utilities whenever possible.
b. Directionally bore utilities and pipes underneath habitats.
6. Develop and implement a habitat restoration plan that addresses site preparation, planting
techniques, control of non-native weeds, native seed mixtures, and post-construction monitoring.
PROJECT IMPLEMENTATION: 7. Contact the Service immediately by telephone at (303) 236–4773 if a Preble’s is found
alive, dead, injured, or hibernating within the project area. Please also contact the Service
if any other listed species are found within the project area.
8. To the maximum extent practicable, limit disturbing (e.g., crushing, trampling) or
removing (e.g., cutting, clearing) all vegetation, such as willows, trees, shrubs, and grasses
within riparian and adjacent upland habitats.
a. Restrict the temporary or permanent removal of vegetation to the footprint of
the project area.
b. Minimize the use of heavy machinery and use smaller equipment when possible.
c. Soil compaction: Temporarily line access routes with geotextiles or other
materials, especially in wet, unstable soils to protect roots and the seed bank.
9. Use the attached table to track the acres or square feet of riparian and upland
habitats temporarily or permanently affected by the response activities.
a. Temporary Impacts: Native vegetation and habitats will reestablish following
rehabilitation (e.g., access route that is rehabilitated with native, weed-free seeds
and plants).
b. Permanent Impacts: Riparian or upland habitats will not return as a result of project
activities (e.g., road surface, concrete footings)
10. Track the volumes of any water from onsite sources stored or used for dust abatement,
soil compaction, concrete mixing, or other activities.
11. Locate, store, stage, operate, and refuel equipment outside of riparian or adjacent
upland habitats.
a. Operate equipment from previously disturbed or modified roadbeds or road
shoulders above the riparian habitats.
b. Limit the number of entrance and exit points leading into the project area.
c. Stockpile topsoil and debris outside the riparian corridor and protect from
stream flows or runoff.
12. During the Preble’s active season (May 1 through November 1), work only during
daylight hours to avoid disrupting Preble’s nocturnal activities.
13. Promptly remove waste to minimize site disturbance and avoid attracting predators.
14. Cover exposed holes or piles of loose dirt with boards, tarps, or other materials to
prevent entrapment.
15. Use best management practices (BMPs) to limit construction-related disturbance, such as
soil compaction, erosion, and sedimentation, and to prevent the spread of invasive weeds;
a.Soil compaction: Establish one access route for workers, vehicles, and machinery,
preferably along a previously disturbed surface or route.
b. Soil compaction: Temporarily line access routes with geotextiles or other materials,
especially in wet, unstable soils.
c. Weed control: Wash and inspect vehicles and equipment before entering or leaving the
project area so that they are free of noxious weed seeds and plant parts.
d. Weed control: Use only weed free certified materials, including gravel, sand, top
soil, seed, and mulch.
16. Complete construction before beginning restoration or enhancement activities.
POST-CONSTRUCTION:
17. Upon project completion, revegetate all disturbed areas with native shrubs, trees, and grasses.
a. Rip compacted access routes prior to replanting with native vegetation.
b. Fill and reseed with weed free material and native seed mixtures.
c. Consult the Service before finalizing a seed and plant list.
18. Bury riprap, then plant with native riparian vegetation.
19. Rehabilitate adjacent habitats impacted by floodwaters to restore connectivity and prevent
future impacts from erosion or sedimentation.
20. Consider monitoring the revegetated areas for success. The Service can help establish
success criteria during the consultation process.
Southeast Region, Area 14 4255 Sinton Road Colorado Springs, CO 80907 P 719.227.5200 | F 719.227.5223
Bob D. Broscheid, Director, Colorado Parks and Wildlife • Parks and Wildlife Commission: Robert W. Bray Jeanne Horne
John Howard, Vice-Chair • Dale Pizel James Pribyl, Chair James Vigil Dean Wingfield Michelle Zimmerman, Secretary Alex Zipp
May 4, 2017
El Paso County
ATTN: Kari Parsons
2880 International Circle,
Colorado Springs, CO 80132
Re: Timber Ridge –Rezone Property to PUD; Preliminary Plan (PUD173)
Dear Kari Parsons,
Colorado Parks and Wildlife (CPW) has reviewed the plans for the retreat at Timber Ridge
near on Vollmer Road and Poco Road. The area included within the Development boundaries
will sustain numerous wildlife species including deer, elk, pronghorn, turkey, black bear,
mountain lion, coyote, fox, raptors, songbirds, and numerous small mammals. CPW makes the
following recommendations.
CPW recommends consultation with the Army Corps of Engineers to ensure compliance with
the Clean Water Act due to the identification of possible jurisdictional wetlands on the site.
CPW will comment on specific plans for wetland-related issues as part of that 404 permitting
process but there are some general recommendations to be considered during the
development of the wetland mitigation plan prepared as part of section 404 permitting.
We would request that all areas of disturbance and exposed soils above the ordinary high
water mark be re-vegetated with a native seed mix. This will contribute to the replacement
of lost riparian vegetation values and minimize establishment of noxious weeds. The
placement of willow sprigs or bare root stock should also be considered along the banks,
especially in those areas which have been disturbed. We recommend planting of vegetation
along the bank to help reduce and control erosion and contribute to bank stability over the
long term. The site should be monitored for a period of at least two growing seasons. Any
stands of noxious weeds that become established should be controlled with appropriate
mechanical and/or chemical methods suitable for the proposed location. CPW recommends
using a clean fill material, if needed, that would be conducive to growing native vegetation
that will help stabilize the banks. Non-native vegetation can overrun native vegetation and
can become problematic. A seed mixture of native grasses is also recommended to provide a
good support system in the soil.
CPW further recommends crossing riparian corridors and streams at a perpendicular angle, in
order to reduce impacts to natural resources, as well as spanning the corridors with structures
located outside the riparian and stream zone. CPW recommends avoiding treed areas of
cottonwood and willow, as these areas provide bird and wildlife habitat. During construction,
stream crossing by construction vehicles should be avoided. CPW requests that any new
service roads that are proposed for construction in conjunction with the project avoid
crossing creeks or stream beds to avoid impacts to wildlife and habitat. If any new access or
maintenance roads will be constructed that cross stream habitat, CPW would like to be
consulted on best management practices and options for construction to minimize impacts. A
construction design for any new or reconstructed riparian crossing that actively minimizes
barriers to fish passage at all water levels and mitigates any existing barriers where possible
would minimize the negative impact of the project on native fish species.
CPW recommends the following Best Management Practices when working in or near aquatic
habitats.
Drainages should be crossed perpendicular to the flow of the stream
Use existing road crossings and existing stream crossings for vehicles and other
construction equipment instead of building new roads and stream crossings
The width of construction should be minimized within the 100-year floodplain,
Stream bank, wetland restoration/improvement should be performed, where
necessary
Vehicle and equipment crossing of creeks/streams should be made in locations that
will cause the least erosion of banks and sedimentation.
As for more general construction protocols, CPW recommends low speeds for construction
vehicles to avoid wildlife collisions. Where new roads are required, CPW recommends that
these single-purpose roads are gated to reduce traffic disruptions to wildlife. If any temporary
(e.g., construction) or permanent fencing is proposed, CPW recommends that it is the
wildlife-friendly fencing that allows young to cross, and does not include high-tensile
hogwire.
CPW recommends the development and implementation of a noxious weed control plan for
the site. All disturbed soils should be monitored for noxious weeds and noxious weeds should
be actively controlled until native plant revegetation and reclamation is achieved. Care
should be taken to avoid the spread of noxious weeds, and all construction equipment should
be cleaned prior to leaving the site. A noxious weed management plan should be developed
prior to any disturbance of the site. CPW recommends that all landscaping in the developed
area should be comprised of native species. Using native species with high food and cover
values in an open space area is beneficial to wildlife. This can encourage wildlife to
concentrate in areas that minimize human conflicts and optimize wildlife watching
opportunities. Native plant species can also provide an aesthetically pleasing landscape that
requires little maintenance, and are frequently more drought-tolerant than non-native
species
CPW recommends a 100 foot buffer zone be permanently placed around the creeks and
ponds. If a trail is constructed near the creek or ponds, it should be a minimum of 100 feet
from the edge. This buffer zone will offer wildlife utilizing the creek and ponds less
disturbance by development and decrease the likelihood of human and wildlife encounters.
The existing native riparian vegetation around the creeks, the ponds and in the drainage ways
should be kept intact for wildlife habitat and to increase ground stabilization.
Trails would provide excellent opportunities for wildlife viewing. However, if trails are
placed too close to areas utilized by wildlife it creates disturbances resulting in reduced
wildlife viewing opportunities. CPW recommends constructing trails on the outer edges of
open space areas. This minimizes wildlife disturbance and creates increased wildlife viewing
opportunities. Trails near creeks and drainage areas should cross perpendicular rather than
run parallel to these critical wildlife habitat areas. Crossings should occur in areas that have
the least usage by wildlife in order to have minimal impacts on wildlife.
There is suitable habitat for nesting raptors and migratory birds along the trail route. CPW
recommends the use of pre-construction surveys to identify raptor nests within the project
area and implement appropriate restrictions. CPW recommends adherence to the
recommended buffer distances and timing stipulations identified in the attached document
“Recommended Buffer Zones and Seasonal Restrictions for Colorado Raptors”.
Care should be taken to avoid the destruction of active dens and nests while constructing
structures, ponds, and trails. Possible dens or nests should be monitored for species activity.
CPW would be concerned if trees and snags were removed for the development. The main
concern with removal of trees is that these trees may be currently occupied or historic nest
sites. Please take care to avoid removal of trees with occupied nests. For raptors, an active
nest is any nest that is frequented or occupied by a raptor during the breeding season or
which has been active in any of the five previous breeding seasons. Many raptors use
alternate nests in various years; therefore, a nest may be active even if it is not occupied in a
given year. Removal or relocation of any active raptor or migratory bird nest will require
consultation with CPW and US Fish and Wildlife Service prior to disturbance. Both active and
potential nest sites, winter night roosts should be considered when evaluating disturbance
during construction.
US Fish and Wildlife Service should be consulted on any Federally-listed Endangered and
Threatened Species that might be present at the location. CPW recommends consultation
with the U.S. Fish and Wildlife Service when permitting any permanent or temporary activity
within known or potentially occupied Preble’s meadow jumping mouse habitat.
Fences can cause many problems for wildlife, including death, entanglements, and barriers to
movements. CPW recommends the developers consult our publication Hanophy, Wendy
“Fencing with Wildlife in mind.” CPW.state.co.us. 2009 when considering the design of fences
within the development. The publication is available on our website and we would be happy
to provide a link to the PDF specifically. The use of privacy fencing, chain link fencing, and
other exclusionary fencing should be at least 6 feet high and should be restricted to the
immediate area surrounding the buildings or within the designated building envelope and
should not be used as a method to designate boundaries of larger lot sizes (> 1 acre). Fencing
outside the immediate building envelope or area surrounding the buildings on larger lots
within the known range of elk, deer and pronghorn should be a maximum top height of 42”
with at least 12” spacing between the top two wires or rails and a bottom wire or rail at least
16” above the ground to allow passage of juvenile animals and pronghorn antelope. It is also
recommended that the top and bottom wires be a twisted barbless type or smooth wire or rail
construction. Construction of ornamental wrought iron fencing with closely spaced vertical
bars (<12”) and sharp projections extending beyond the top horizontal bar should be strongly
discouraged in areas where deer, elk, and black bear are known to occur. This type of fencing
typically ensnares deer and elk by the hips when trying to squeeze through and impales
animals attempting to go over the top. It should be noted that it is very distressing to find
wildlife in or impaled on fences.
Due to the potential presence of black bears in the Development, CPW recommends several
measures to reduce the potential for human bear conflicts. First, we recommend that the
owner invests in bear-proof trash containers. Trash containers should be stored in the garage
or in a solid locked storage shed until the morning of trash collection during those months
when bears are most active (April – November). Another possible alternative would be the use
of a centralized and securely fenced trash collection site with the use of bear proof
dumpsters that employees, customers, and the trash service provider would have access to.
This would eliminate the need for individual trash cans. Second, residents and food vendors
should also keep their barbecues and any food locked away in the garage or a secure building.
Finally, we would recommend that the use of bird feeders and hummingbird feeders be
discouraged, during the months mentioned above, since they also attract black bears.
However, if feeders are used, they should be placed so they are inaccessible to black bears,
raccoons, skunks, deer and other wildlife species that might cause damage or threaten human
safety. A copy of a brochure entitled, “living with wildlife in bear country” is available for
reference upon request from CPW.
The following is a list of general recommendations the CPW would like to be taken into
consideration with the residential side of this development in order to avoid nuisance
conflicts with wildlife. Many times these conditions can be enforced through the local
Homeowner’s Association or through covenants.
Pets should not be allowed to roam free and fences should be installed to decrease or
eliminate this problem. Dogs and cats chase or prey on various wildlife species. One benefit
to keeping animals under control is that they are less likely to bother other people, be in
roadways or become prey for mountain lions, coyotes, foxes or owls.
Trash should be kept indoors until the morning of trash pickup. The CPW recommends using
bear resistant trash containers. Bears, skunks, raccoons, and neighborhood dogs are
attracted to garbage and do become habituated.
Feeding of all wildlife should be prohibited, with the exception of songbirds. The use of bird
feeders, suet feeders, and hummingbird feeders are discouraged. However, if feeders are
used, they should be placed so they are inaccessible to bears, raccoons or skunks and other
wildlife species that might cause damage or threaten human safety. It is illegal to feed big
game including deer, elk, antelope, moose, bear and lion.
Pets should be fed inside or if pets are fed outside, feeding should occur only for a specified
period of time and food bowls returned afterwards to a secure site for storage. Pet food left
outside attracts various wildlife species which in turn attracts predators.
When landscaping lots, it is strongly recommended that native vegetation be used that
wildlife is less likely to be attracted to. Planting of trees and shrubs that are attractive to
native ungulates should incorporate the use of materials that will prevent access and damage
(fencing, tree guards, trunk guards, etc.).
It is strongly encouraged that dog kennels have a top enclosure, regardless of the height of
the kennel.
CPW appreciates being given the opportunity to comment. Please feel free to contact District
Wildlife Manager Benjamin Meier at 719-227-5231 or [email protected] should you
have any questions or require additional information.
Sincerely,
Frank McGee
Area Wildlife Manager
Cc: SE Region Files
Area 14 Files
Benjamin Meier, DWM
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
ATTACHMENT VII
WETLAND DELINEATION REPORT
WETLAND DELINEATION REPORT
The Retreat at Timber Ridge Residential Development Project
El Paso County, Colorado
Project No. 16-059
PREPARED FOR:
Arroya Investments LLC
P.O. Box 50223
Colorado Springs, CO 80949
Phone: 719-491-3150
Contact: Peter Martz
PREPARED BY:
CORE Consultants, Inc.
1950 W. Littleton Boulevard, Suite 109
Littleton, CO 80120
Phone: 303-703-4444
Contact: Chris Haas
CORE Project Number: 16-059
December 5, 2017
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page ii of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
TABLE OF CONTENTS
EXECUTIVE SUMMARY ................................................................................................. III
1.0 INTRODUCTION ....................................................................................................... 4
2.0 SITE DESCRIPTION ................................................................................................... 4
3.0 METHODS .................................................................................................................... 4
4.0 BACKGROUND DOCUMENTATION REVIEW ..................................................... 5
4.1 Aerial Photograph Review Results .................................................................................................................... 5
4.2 National Wetlands Inventory Map Review ..................................................................................................... 5
4.3 USGS Topographic Map Review ........................................................................................................................ 6
4.4 FEMA FIRM Floodplain Review .......................................................................................................................... 6
4.5 County Soil Survey Map Review ........................................................................................................................ 6
5.0 RESULTS ...................................................................................................................... 6
5.1 Watercourses Including Jurisdictional Channels............................................................................................ 6
5.2 Wetlands ................................................................................................................................................................. 7
5.3 Soils ........................................................................................................................................................................... 9
5.4 Hydrology.............................................................................................................................................................. 10
5.5 Vegetation ............................................................................................................................................................. 11
6.0 CONCLUSIONS AND RECOMMENDATIONS .................................................... 11
REFERENCES .................................................................................................................. 13
TABLES TABLE 5-1. WETLANDS AND JD CHANNELS IN PROJECT ............................................................................................. 6
APPENDICES APPENDIX I: FIGURES
FIGURE 1. SITE LOCATION MAP
FIGURE 2. NATIONAL WETLAND INVENTORY MAP
FIGURE 3. FEMA FLOOD INSURANCE RATE MAP
FIGURE 4. SOIL COMPLEXES MAP
FIGURE 5. WETLAND LOCATION MAP
APPENDIX II: PHOTOGRAPHIC LOG
APPENDIX III: WETLAND DELINEATION DATA FORMS
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page iii of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
EXECUTIVE SUMMARY
CORE Consultants, Inc. (CORE) was retained by Arroya Investments, LLC (Client) to perform a wetland
delineation for the proposed Retreat at Timber Ridge Residential Development Project (Project) in El
Paso County, Colorado. The Project is located adjacent to and surrounding the intersection of Vollmer
Road and Arroya Lane and is on the U.S. Geological Survey (USGS) Falcon North West 7.5-minute
quadrangle. It encompasses approximately 264 acres on Sections 17, 21, 22, and 28 in Township 12 South,
Range 65 West. The Project would consist of the construction of single family residential homes,
permanent access roads, and associated facilities.
This Executive Summary is intended to be taken in context with the following report and is not designed
to be used as a separate document. The following summarizes the results of the wetland delineation.
This document is an assessment of the potential regulatory status of wetlands, significant bodies of water,
watercourses, and/or floodplains located within the Project, based on Section 404 of the Clean Water
Act (CWA) and Section 10 of the Rivers and Harbors Act. The wetland delineation was performed in
accordance with the US Army Corps of Engineers (USACE) Great Plains Regional Supplement (Version
2.0) and the 1987 USACE Wetland Delineation Manual.
CORE conducted a site visit to assess the presence of wetlands, watercourses or other similar features
within the Project on May 15 and 16, 2017. Potentially jurisdictional aquatic features were delineated on-
site. Observations of hydric soils, wetland vegetation, and hydrology aided in CORE’s determination of
the potential regulatory status of Waters of the U.S., including wetlands, within the Project.
Based on the field reconnaissance and document review, it is the opinion of CORE that the main channel
of Sand Creek and associated wetlands exhibit characteristics of Waters of the U.S. per Section 404 of
the CWA. Therefore, a USACE permit would be required for the discharge of dredged or fill material
into this channel and associated wetlands. Permanent impacts to jurisdictional waters could result from
the development of the Project and, depending on the extent of permanent impacts, could be permitted
under a Nationwide Permit or Section 404 Individual Permit.
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page 4 of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
1.0 INTRODUCTION
CORE Consultants, Inc. (CORE) was retained by Arroya Investments, LLC (Arroya) to perform a routine
wetland delineation of the proposed Timber Ridge Residential Development Project (Project) located in
El Paso County, Colorado. This report presents the results of the wetland delineation for the Project.
The Project encompasses approximately 264 acres located adjacent to and surrounding the intersection
of Vollmer Road and Arroya Lane, northeast of the Woodmen Road and Black Forest Road intersection.
The Project is on the U.S. Geological Survey (USGS) Falcon North West 7.5-minute quadrangle, on
portions of Sections 21, 22, 27, and 28 in Township 12 South, Range 65 West (Attachment 1: Site
Location Map). The approximate coordinates of the Project center are latitude 38.980576° N and longitude
-104.663569° W (WGS 84 datum). Project elevation ranges from approximately 7,150 feet above mean
sea level (AMSL) to 7,400 feet AMSL.
It is anticipated that Project impacts to Waters of the U.S. (WOUS) would result from development of
the Project. As such, Project construction would require permitting under Section 404 of the Clean Water
Act (CWA).
2.0 SITE DESCRIPTION
The Project lies within the Fountain watershed, referenced as 8-digit Hydrologic Unit Code (HUC)
11020003. The main channel of Sand Creek and multiple unnamed tributaries drain the Project in a
southerly direction. Land use in the region is typified by rangeland grazing with increasing urban and
residential development. Topography of the Project consists of rolling foothill grasslands within the
southern portion of the Project transitioning into pine-oak woodlands within the northern portion of the
Project (Chapman et al. 2006). Scattered, shallow ridges and dense stands of ponderosa pine (Pinus
ponderosa) are located across the northern portion of the Project and coincide with the southern
boundary of Black Forest.
Dominant species within the foothills grasslands include little bluestem (Schizachyrium scoparium), big
bluestem (Andropogon gerardii), switch grass (Panicum virgatum), and yellow Indiangrass (Sorghastrum nutans).
Scattered pine-oak communities are located across higher elevation areas of the foothills grasslands.
Ponderosa pine and Gambel oak (Quercus gambelii) dominate the canopy and understory of the pine-oak
woodlands. Mountain mahogany (Cercocarpus montanus), skunkbush (Rhus trilobata), western serviceberry
(Amelanchier alnifolia), and chokecherry (Prunus virginiana) are also found scattered throughout the
understory.
3.0 METHODS
The purpose of the wetland delineation was to survey and delineate the boundaries of potentially
jurisdictional aquatic features within the Project, as defined under Section 404 of the Clean Water Act
(CWA) and Section 10 of the Rivers and Harbors Act.
Prior to the field survey, a preliminary desktop analysis was performed to evaluate overall water resource
characteristics of the Project and determine the presence of potentially jurisdictional watercourses. Spatial
data and aerial imagery sources reviewed included:
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page 5 of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
• National Hydrography Dataset (NHD);
• USGS topographic maps;
• U.S. Fish and Wildlife Service (USFWS) National Wetlands Inventory (NWI) maps;
• Natural Resource Conservation Service (NRCS) soil survey maps; and,
• Flood Emergency Management Agency (FEMA) floodplain maps.
Watercourses and other aquatic features identified in the preliminary desktop analysis were inspected in
the field to assess their jurisdictional potential. A site visit and wetland delineation were conducted on
May 15 and 16, 2017. The wetland delineation was performed in accordance with the Western Mountains,
Valleys, and Coasts Regional Supplement (Version 2.0) (USACE 2010) to the 1987 USACE Wetland
Delineation Manual (USACE 1987).
The determination of a wetland depends on the presence or absence of three parameters: 1) hydrophytic
vegetation, 2) hydric soils, and 3) wetland hydrology during the wettest season. Vegetation, soils, and
hydrology were analyzed for the determination of the presence of wetlands, watercourses, and other
special aquatic features. A wetland boundary delineation was conducted along potential Waters of the
U.S. (WOUS), within the Project. Boundaries were mapped using a Trimble Geo 6X global positioning
system (GPS) unit with sub-foot accuracy. Photographs were recorded depicting field conditions at the
time of the site visit (Appendix II: Photographic Log). Results of the field assessment and descriptions of
observed features are detailed below (Appendix III: Wetland Delineation Data Forms).
4.0 BACKGROUND DOCUMENTATION REVIEW
Aerial photographs, NWI maps, USGS Topographic maps, FEMA flood insurance rate maps (FIRM), and
county Soil Survey maps were utilized to document Project background information. A discussion of each
evaluation process follows.
4.1 Aerial Photograph Review Results Aerial photographs dated 1999, 2003, 2004, 2005, 2006, 2008, 2011, 2013, 2015, and 2016 were
obtained from the U.S. Department of Agriculture (USDA) Farm Service Agency (USDA 2016). Aerial
photograph interpretation was conducted to identify potential wetlands, watercourses, and other
notable landscape features within the property. Aerial imagery indicated the presence of a defined
bed and bank along Sand Creek within the Project; incision and erosion of the channel appears
greatest along the southern portion of the drainage within the Project. The review of aerial imagery
indicated the potential presence of large wet meadow complexes north of Arroay Lane within the
Project. An interpretation of vegetation color associated with Sand Creek would indicate the
presence of wetland vegetation within and along the drainage corridor.
4.2 National Wetlands Inventory Map Review A review of NWI maps (USFWS 2017) was conducted to determine the potential presence, location,
size, and type of wetlands located within the Project. The USFWS generates NWI maps through
aerial photograph interpretation. NWI maps may not accurately depict the extent or existence of
wetland systems in a specific area, nor do maps consistently and accurately identify wetland type. As
such, the maps were utilized for preliminary analysis only. Field reconnaissance was conducted to
determine the true extent and type of wetlands located within the Project.
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page 6 of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
NWI data indicated the presence of one potential wetland in the Project classified as palustrine,
unconsolidated bottom, semipermanently flooded wetland (Figure 2: National Wetland Inventory
Map):
The NWI-identified wetland was inspected in the field and was confirmed with field observations;
The NWI wetland presented as manmade stock ponds in the field. The remainder of wetlands
identified on the Project were not identified by the NWI database.
4.3 USGS Topographic Map Review The USGS 7.5-Minute Topographic Map – Falcon North West quadrangle (USGS 1965, Revised 1994)
– indicates that elevations within the Project range between approximately 7,150 and 7,400 feet
AMSL (Figure 1). The property is generally flat with rolling hills and swales; higher elevations are
located across the northern portion of the Project and gradually lessen towards the southern portion
of the Project. No manmade facilities are depicted on the topographic map apart from Vollmer Road
bisecting the Project.
4.4 FEMA FIRM Floodplain Review A review of FEMA FIRM floodplain maps (FEMA 1997) was conducted to determine the existence,
location, and extent of floodplains located within the Project. The FIRM maps depict floodplain areas
along rivers and tributaries. The maps record the following data: 100-year (1% chance of annual
flooding; Zone A) and 500-year (0.2% annual chance of flooding) floodplains, the height of the base
flood (Base Flood Elevations), and the risk premium zones developed from topographical information
across a floodplain. FEMA generates FIRM floodplain maps for flood insurance purposes.
A review of the Counties’ FEMA FIRM panels (1997) indicate the Project is located within the
boundary of FIRM panel 08041C0535G, El Paso County (Figure 3: FEMA Flood Insurance Rate Map).
The Sand Creek drainage is located within a Zone A floodplain, which indicates areas at a 1% risk of
inundation during annual flooding. The remainder of the Project is located within Zone X flood zones,
which consist of areas of minimal flood risk “outside the 1% and 0.2% annual-chance floodplains”
(FEMA 1997).
4.5 County Soil Survey Map Review The Counties’ Soil Survey indicated the Project is composed of two soil series:), Kettle gravelly loamy
sand (3 to 8 percent slopes and 8 to 40 percent slopes), and Pring coarse sandy loams (3 to 8 percent
slopes) (Natural Resources Conservation Service [NRCS 2017]) (Figure 4: Soil Complexes Map). All
soil series comprising the Project are classified as hydric soils in El Paso County by the (NRCS 2014).
5.0 RESULTS
5.1 Watercourses Including Jurisdictional Channels The desktop review and field reconnaissance indicated that the main channel of Sand Creek and its
unnamed tributaries drain the Project in a southerly direction. (Figure 5: Wetland Location Map).
The Sand Creek drainage corridor within the Project is largely undisturbed; a culvert maintains
hydrologic connectivity across Arroya Lane.
Sand Creek north of Arroya Lane presented as a multi-channel network of headwaters that
converged at the main channel immediately north of Arroya Lane, within the Project. Defined bed
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page 7 of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
and banks were observed across the main channel of Sand Creek and its unnamed tributary
headwaters in this area north of the Project. Stream channels containing wetlands (SCCW) were
present north of Arroya Lane (SCCW 2; Figure 5).
The main channel of Sand Creek south of Arroya Lane presented as a well-defined SCCW for much
of its stretch within the Project. The northern portion of Sand Creek south of Arroya Lane presented
as a narrow (1-2-foot-wide) channel with multiple ponded areas and abutting wetlands (SCCW 3,
Wetland 3; Figure 5); surface water was present throughout this stretch of the channel. The central
portion of the Sand Creek channel transitioned to a wide, sandy drainage that largely mirrored the
extent of the floodplain (Jurisdictional [JD] channel A; Figure 5).
Potentially jurisdictional channels were present within the western and eastern tributary. JD channel
B (western tributary) presented as a well-defined, eroded channel that extended to an existing two-
track road and fence line. JD C (eastern tributary) was observed along a short stretch between the
western portion of the tributary identified as part of SCCW 5, and the eastern portion of the
tributary identified as SCCW 4. JD C presented as a weakly defined channel with upland vegetation
and sparse wetland vegetation observed in the field.
South of SCCW 5, a narrow sandy channel is present for a short stretch (JD D) prior to the
reappearance of a well-established stream-wetland complex (Wetland 4, SCCW 6; Figure 5). Highly
incised and eroded banks were present from the headcut of SCCW 6 to the southern boundary of
the Project; however, braided streams and extensive abutting wetland complexes were present
throughout this southern portion of the Project. Surface water was present throughout SCCW 6
and multiple, natural ponded areas are located recurrently throughout the channel in this stretch of
the drainage.
5.2 Wetlands Wetlands were observed at 12 locations within the Project including four isolated wetlands; JD
channels were observed at four locations within the Project (Table 5-1: Wetlands and JD Channels
in Project). All observed wetlands (excluding isolated wetlands) and JD channels were determined
potentially jurisdictional. Soils, hydrologic indicators, and vegetation were examined on site to
determine the presence or absence of wetlands.
A culvert maintains hydrologic connectivity between SCCW 2 and SCCW 3 north and south of
Arroya Lane. Field indicators included surface water and dense hydrophytic vegetation lining the
channels north and south of Arroya Lane. Field sampling indicated the presence of hydric soils and
hydrologic indicators within the boundaries of SCCW 2 (immediately outside of the Project). SCCW
2 was characterized as riverine, intermittent, stream bed, intermittently flooded (R4SBJ); surface
water was present in portions of the channel. Field sampling within SCCW 3 indicated the presence
of anoxic soil conditions; surface water and/or saturation was observed throughout SCCW 3
(Appendix II). SCCW 3 was characterized as R2UBF. A depressional wetland (Wetland 3) was
observed outside of the stream channel abutting SCCW 3, south of Arroya Lane (Figure 5, Table
5-1).
The drainage transitioned from SCCW to short stretches of dry channel within the central portion
of the Project, in the vicinity of the western and eastern tributary. Incision and erosion of the main
channel of Sand Creek increased at this location; large contiguous zones of upland vegetation were
observed within the ordinary high water mark (OHWM). Well defined dry channels were observed
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page 8 of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
within the western tributary (JD channel B), across a short stretch of the main channel of Sand Creek
(JD channel A, JD channel D), and across a short stretch of the eastern tributary (JD channel C)
(Figure 5, Table 5-1). SCCW 4 was observed upstream of JD channel C within the eastern tributary
and was characterized as PEM1C; it is likely that the in-channel wetlands at SCCW 4 exist as a result
of seepage from the stock pond (Pond 1). Although a berm exists across the channel upstream of
SCCW 4, saturation was observed at the berm and it was determined that hydrologic connectivity
is maintained between SCCW 4 and Pond 1. Pond 1 was characterized as L1UB3Hh (lacustrine,
limnetic, unconsolidated bottom, mud, permanently flooded, diked/impounded).
The main channel of Sand Creek transitioned between a dry channel and SCCW 5 for approximately
800 feet within the vicinity of the western and eastern tributary (Figure 5). A small depressional
wetland (Wetland 4) was observed abutting JD channel D and was characterized as PEM1C. A well-
defined headcut was observed at the downstream edge of JD channel D, at which point a well-defined
SCCW (SCCW 6) is present to the southern boundary of the Project (Appendix II). SCCW 6 was
characterized as R2UBF throughout its stretch in the southern portion of the Project; flowing water
and ponded areas were present at the time of the field visit. Field indicators of SCCW 6 included
hydric soils, surface water and/or saturation, and dense stands of hydrophytic vegetation within and
adjacent to the braided channels of Sand Creek (Figure 5, Appendix III).
A minor, isolated swale was located to the northwest of the intersection of Vollmer Road and Arroya
Lane. Culverts are located under the Vollmer Road and Arroya Lane crossings, which have likely
resulted in the extension of the reach of the swale downstream. Small areas of isolated wetlands
were observed on the western side of the culvert (Isolated Wetland 2), eastern side of the culvert
(Isolated Wetland 3), and southern side of Arroya Lane (Isolated Wetland 4) (Figure 5). Wetlands
were not observed downstream of Isolated Wetland 4: the swale transitions to uplands
approximately 900 feet downstream of the culvert crossing.
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page 9 of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
Table 5-1. Wetlands and JD Channels in Project
Wetland ID Latitude Longitude Wetland Type
SCCW 2 38.987510° N -104.661942°W R4SBJ (Riverine, intermittent, stream bed,
intermittently flooded)
SCCW 3 38.982892°N -104.662175°W
R2UBF (riverine, lower perennial,
unconsolidated bottom, semipermanently
flooded)
Wetland 3 38.982246° N -104.661788° W PEM1C (palustrine, emergent, persistent,
seasonally flooded)
Isolated Wetland
1 38.980263° N -104.661558° W
PEM1C (palustrine, emergent, persistent,
seasonally flooded)
JD Channel A 38.979594° N -104.661871° W NA-Ordinary High Water Mark
(OHWM)
SCCW 4 38.980312° N -104.659737° W PEM1C (palustrine, emergent, persistent,
seasonally flooded)
SCCW 5 38.979186° N -104.661799° W PEM1C (palustrine, emergent, persistent,
seasonally flooded)
Wetland 4 38.978915° N -104.662309° W PEM1C (palustrine, emergent, persistent,
seasonally flooded)
Wetland 5 38.980948° N -104.659111° W
L1UB3Hh (lacustrine, limnetic,
unconsolidated bottom, mud,
permanently flooded, diked/impounded)
JD Channel B 38.979668° N -104.663490° W NA-Ordinary High Water Mark
(OHWM)
JD Channel C 38.979266° N -104.661274° W NA-Ordinary High Water Mark
(OHWM)
JD channel D 38.978781° N -104.662588° W NA-Ordinary High Water Mark
(OHWM)
SCCW 6 38.977475° N -104.663490° W
R2UBF (riverine, lower perennial,
unconsolidated bottom, semipermanently
flooded)
Isolated Wetland
2 38.984138 ° N -104.666265 ° W
PEM1C (palustrine, emergent, persistent,
seasonally flooded)
Isolated Wetland
3
38.984016° N -104.665910° W PEM1C (palustrine, emergent, persistent,
seasonally flooded)
Isolated Wetland
4
38.983738° N -104.665633° W PEM1C (palustrine, emergent, persistent,
seasonally flooded)
5.3 Soils As described above, the dominant soil associations located within the Project include Kettle gravelly
loamy sand (3 to 8 percent slopes and 8 to 40 percent slopes), and Pring coarse sandy loams (3 to 8
percent slopes) (NRCS 2017) (Figure 4). All soil series within the Project are listed as hydric within
El Paso County (NRCS 2014). Project totals for each dominant soil series/complex are as follows:
• Kettle gravelly loamy sand (3 to 8 percent slopes and 8 to 40 percent slopes) makes up less than
1% of the Project;
• Pring coarse sandy loams (3 to 8 percent slopes) makes up 95% of the Project and is dominant
across the Sand Creek drainage.
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page 10 of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
Six soil samples were taken at sample points within the Project (Figure 5). All Sample Points were
located within the Pring coarse sandy loam complex. Sample Point 1 consisted of loams, loamy sands,
and silty clays; the soil profile of Sample Point 1 contained distinct layers of starkly different soil
textures. Positive soil indicators at Sample Point 1 included a depleted matrix (F3) and loamy gleyed
matrix (F2) (Appendix III). The gleyed matrix is likely a result of anoxic conditions since Sample
Point 1 was well within the wetland boundary. Sample Point 2 consisted of sandy loams; no hydric
soil indicators were observed at Sample Point 2 (Appendix III). Soils at Sample Point 2 were uniform
from the surface to 18 inches at depth. Sample Point 3 consisted of sand grains of varying colors from
the surface to 18 inches depth; no hydric soil indicators were observed at Sample Point 3 (Appendix
III). The soil profile at Sample Point 4 comprised three distinct layers consisting of sandy loams,
loamy sands, and sandy loams. Groundwater was present at 8 inches depth; hydrogen sulfide odor
(A4) was observed. The soil profile at Sample Point 5 comprised three distinct layers consisting of
loamy sands; different chromas and values were observed within each layer. The water table was
observed at 8 inches depth, and a gley value and chroma were recorded at the time of sampling.
Since the gley soil color was not observed within six inches of the surface, a sandy gleyed matrix was
not indicated positive. However, sandy redox (S5) and hydrogen sulfide odor (A4) indicators were
observed (Appendix III). The soil profile at Sample Point 6 consisted of three distinct layers of
sandy clay loams, sandy loams, and sandy clay loams. Redox features were distinct within each layer
and hydric soil indicator – depleted matrix (F3) was recorded.
5.4 Hydrology Hydrology across the Project is provided by normal precipitation and runoff events. Hydrology of
the main channel of Sand Creek and its tributaries is largely undisturbed, but may be influenced at
some locations by stock pond seepage. Hydrology of abutting and the isolated wetlands is provided
by intermittent to seasonal inundation from runoff.
The hydrology of Sand Creek north of Arroya Lane is provided intermittently by year-round
precipitation events. Surface water was not present within SCCW 2; however, field sampling
indicated the presence of highly distinct oxidized rhizospheres on living roots (C3). Hydrology of
SCCW 2 was characterized as intermittent since surface water was not observed during the growing
season at the time of the site visit.
The main channel of Sand Creek south of Arroya Lane presented as perennial throughout most of
its stretch within the Project. Surface water was present within SCCW 3 at the time of the field visit;
the absence of vegetation across the channel would suggest inundation occurs throughout most of
the year. Oxidized rhizospheres (C3) were observed at Sample Point 1 within SCCW 3. SCCW 4
and SCCW 5 presented as seasonally flooded emergent wetlands. The hydrology of SCCW 4 is likely
additionally provided, in part, by seepage of the stock pond upstream of the channel (Pond 1).
Saturation was observed immediately downstream of the berm at the upstream boundary of SCCW
4. Since saturation was observed at this location and hydrologic connectivity is maintained through
the berm, it was determined that a significant nexus exists between SCCW 4 and Pond 1. As such,
Pond 1 was determined jurisdictional. Positive hydrologic indicators at Sample Point 4 within SCCW
5 included a high water table (A2), saturation (A3), and hydrogen sulfide odor (C1) (Appendix III).
The main channel of Sand Creek downstream of SCCW 5 transitions to a dry channel (JD Channel
D) for approximately 250 feet. A seasonally inundated depressional wetland (Wetland 4) was
observed abutting the northern edge of JD Channel D. Hydrology of Wetland 4 is likely provided by
seasonal inundation and a high water table as evidenced by the high water table at Sample Point 4.
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page 11 of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
SCCW 6 was characterized as a lower perennial stream channel containing wetlands. A strong
headcut is located at the upstream edge of SCCW 6, and flowing water was present throughout its
stretch within the Project (Appendix II). The low-flow channel resulted in multiple ponded areas
and braided channels within this portion of the drainage. Positive hydrology indicators observed at
Sample Point 5 within SCCW 6 included oxidized rhizospheres on living roots (C3) and the presence
of the water table at 18 inches depth and saturation present at 17 inches depth within the sampling
pit (Appendix III).
5.5 Vegetation Wetland plant indicator status was determined following the Western Mountains, Valleys, and Coasts
National Wetland Plant List (Lichvar et al. 2016). Upland areas were dominated by pine-oak
woodlands and foothills grasslands native and noxious species including ponderosa pine (Pinus
ponderosa), quaking aspen (Populus tremuloides), eastern cottonwood (Populus deltoides), wild rose
(Rosa woodsii), yellow sweet clover (Melilotus officinalis), harebell (Campanula rapunculoides), curly dock
(Rumex crispus), soapweed yucca (Yucca glauca), common mullein (Verbascum thapsus), knapweeds
(Centaurea spp.), willows (Salix ssp.), crested wheatgrass (Agropyron cristatum), squirrel tail (Elymus
elymoides), blue grama (Bouteloua gracilis), and fescue (Festuca sp).
Monotypic stands of hydrophytic vegetation were present within a well-defined wetland boundary at
most wetland locations throughout the Project. Cottonwoods, aspens, and dense stands of willows
lined a well-developed riparian corridor throughout much of the main channel of Sand Creek
(Appendix II).
Nebraska sedge lined the channel bed within SCCW 2; Baltic rush (Juncus arcticus) was observed
within and adjacent to SCCW 2 immediately outside of the wetland/upland boundary. Wetland
vegetation within the main channel of Sand Creek south of Arroya Lane was dominated by Nebraska
sedge, Baltic rush, and narrow-leaved cattail within ponded areas (Appendix II). Baltic rush was
observed both within and immediately outside of the wetland/upland boundary. The western and
eastern tributaries were dominated by Nebraska sedge, Baltic rush, and clustered field sedge (Carex
praegracilis).
6.0 CONCLUSIONS AND RECOMMENDATIONS
In summary, the Project is located within the Fountain watershed. The main channel of Sand Creek, and
associated tributaries drain the Project in a southerly direction. A well-defined bed and bank were
observed along the main channel of Sand Creek throughout its stretch within the Project; wetlands are
present within and abutting the stream channel throughout much of the drainage. Wetlands were observed
north and south of Arroya Lane, wiothin and adjdacent to the main channel of Sand Creek and its
tributaries. Accordingly, impacts to this channel and abutting or adjacent wetlands would require
permitting through the USACE under Section 404 of the CWA.
The USACE typically has jurisdiction over navigable or traditionally navigable waters, relatively permanent
waters, and wetlands that abut such waters, and determines jurisdiction over other waters based
predominantly on their significant nexus to navigable or traditionally navigable waters (i.e. WOUS). A
permit under Section 404 of the Clean Water Act is required for the discharge of dredged or fill material
into WOUS and mitigation may be required pending Project impacts.
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page 12 of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
While the USACE regulates only those activities resulting in a discharge of dredge or fill material into
waters of the U.S., the Colorado Department of Public Health and Environment (CDPHE) has the
authority to regulate activities resulting in a discharge of pollutants into state waters. The CDPHE
conducts Section 401 certification reviews of projects in Colorado requiring a Section 404 permit from
the USACE. The purpose of review for certification is to determine whether a proposed discharge will
comply with Colorado water quality standards.
Should impacts to WOUS result in the loss of greater than 0.5 acre and/or 300 linear feet of stream bed,
the Project would be permitted under an Individual Permit (IP). A Pre-Construction Notification is not
required for activities permitted under an IP. Rather, IPs require a 30-day public notice period, and a
separate 401 Water Quality Certification through CDPHE.
Should you have any questions regarding this report or any other matter, please feel free to contact us at
(303) 703-4444.
Sincerely,
CORE Consultants, Inc.
Tina Brazil
Environmental Consultant
Wetland Delineation Report
The Retreat at Timber Ridge Residential Development
El Paso County, Colorado
December 5, 2017
Page 13 of 13 CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
REFERENCES
Chapman, S.S., G.E. Griffith, J.M. Omernik, A.B. Price, J. Freeouf, and D.L. Schrupp. 2006. Ecoregions of
Colorado (color poster with map, descriptive text, summary tables, and photographs): Reston,
Virginia, U.S. Geological Survey (map scale 1:1,950,000).
Federal Emergency Management Agency. 1997. El Paso County, Colorado FEMA Flood Insurance Rate
Maps. Panel 08041C0535G.
Lichvar, R.W., M. Butterwick, N.C. Melvin, and W.N. Kirchner. 2016. The National Wetland Plant List:
2016 Update of Wetland Ratings. Phytoneuron 2016-30: 1-17.
Natural Resources Conservation Service. 2014. List of Hydric Soils. Available online at:
http://www.nrcs.usda.gov/wps/portal/nrcs/main/soils/use/hydric/.
_____. 2017. Official Soil Series Descriptions. Available online at:
https://soilseries.sc.egov.usda.gov/osdname.aspx
U.S. Army Corps of Engineers. 2010. Regional Supplement to the Corps of Engineers Wetland
Delineation Manual: Western Mountains, Valleys, and Coasts Regional Supplement (Version 2).
. 1987. Wetlands Delineation Manual.
U.S. Department of Agriculture. 2010. Farm Service Agency – National Agricultural Imagery Program.
U.S. Fish and Wildlife Service. 2017. National Wetland Inventory. Available online at
http://www.fws.gov/wetlands/.
U.S. Geological Survey 7.5-Minute Topographic Maps. 1994. Sable Quadrangle – Colorado.
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
APPENDIX I FIGURES
FIGURE 1. SITE LOCATION MAP
FIGURE 2. NATIONAL WETLAND INVENTORY MAP
FIGURE 3. FEMA FLOOD INSURANCE RATE MAP
FIGURE 4. SOIL COMPLEXES MAP
FIGURE 5. WETLAND LOCATION MAP
Retreat at Timber RidgeSite Location Map
El Paso County, Colorado
0 2,000 4,000Feet
q
Project Boundary
UT
KS
NM
NE
WY
OKAZ
Project Area
Colorado Vicinity
Reference:USGS 7.5 Minute
Topographic QuadrangleFalcon NW, CO Quad
Date: 12/5/2017CORE Project #: 16-059
FIRM Panel08041C0535G
Flaming Sun Dr
Glenside Dr
Old Settlers Trl
Wildflower Rd
Millard Way
Arroya Ln
Poco Rd
Vollm
er
Rd
To
ma
ha
wk T
rl
Hu
nts
ma
n R
d
Date: 12/6/2017
CORE Project #: 16-059
The Retreat at Timber RidgeFEMA FIRM Panel
El Paso County, Colorado
0 1,000 2,000Feet
q
Project Boundary
NHD Watercourse
Revised Floodplain (LOMR)
Salbeck Ln
Glenside Dr
Old Settlers Trl
Flaming Sun Dr
Shipman LnToltec Ln
Wildflower Rd
Millard WayBe
nn
iso
n T
er
Arroya Ln
Poco Rd
Th
om
as
Rd
Vollm
er
Rd
To
ma
ha
wk T
rl
Hu
nts
ma
n R
d
Ra
yg
or
Rd
19
71
71
41
41
41
4171
71
71
40
4040
19
The Retreat at Timber RidgeCounty Soil Survey Map
El Paso County, Colorado
0 1,000 2,000Feet
q
Project Boundary
NHD Watercourse
Soil
Map Symbol Soil Name19 Columbine gravelly sandy loam, 0 to 3 percent slopes40 Kettle gravelly loamy sand, 3 to 8 percent slopes41 Kettle gravelly loamy sand, 8 to 40 percent slopes71 Pring coarse sandy loam, 3 to 8 percent slopes
El Paso County Soil Survey
Date: 12/5/2017
CORE Project #: 16-059
b b b b b
b b b b b
b b b b b
b b b b b
b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b
b b bb b b b
b b b b
b b b b
b b b b
b b b b
b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b b b b b b b b b b
b b b
b b b
b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b b b b b b b b b
b b b
!A
!A
!A
!A
!A
!A
IsolatedWetland 2±0.01 ac
SCCW 2±0.02 ac
SCCW 5±0.08 ac
SCCW 4±0.31 ac
Wetland 4±0.05 ac
Wetland 3±0.23 ac
SCCW 3±2.17 ac
IsolatedWetland 1±0.21 ac
SCCW 6±2.14 ac
JD Channel D
JD Channel C
JD Channel A
JD Channel B
Wetland 5±0.12 ac
IsolatedWetland 4±0.19 ac
IsolatedWetland 3±0.03 ac
Poco Rd
Wildflower Rd
Arroya Ln
Vollm
er
Rd
SP 1
SP 2
SP 3
SP 4
SP 5
SP 6
Date: 12/5/2017
CORE Project #: 16-059
Trails at Timber RidgeWetland Location MapEl Paso County, Colorado
q
0 500 1,000Feet
Project Boundary
NHD Watercourse
NHD Waterbody
!A Sample Point
JD Channel (OHWM)
b b b b b
b b b b b
b b b b b Stream Channel Containing Wetlands
b b b b b
b b b b b Wetland
Pond
Isolated Wetland
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
APPENDIX II
PHOTOGRAPHIC LOG
Photographic Log
The Retreat at Timber Ridge Residential Development Project
El Paso County, Colorado
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
South of Aroya Lane, looking north at SCCW 3
SCCW 3, facing north
Photographic Log
The Retreat at Timber Ridge Residential Development Project
El Paso County, Colorado
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
Eastern tributary, facing east
Eastern tributary, facing east
Western tributary, facing west
Photographic Log
The Retreat at Timber Ridge Residential Development Project
El Paso County, Colorado
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
Southern portion of Sand Creek main channel, facing south at SCCW 6
Immediately north of Arroya Lane, facing north at SCCW 2
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
Criterion 1 = Wetland Regime Criterion 4 = Natural vs Manmade
Criterion 2 = Distance to Foraging Habitat Criterion 5 = Wetland Mosaic
Criterion 3 = Wetland Size Criterion 6 = Within Corridor
P = Palustrine H = Permanently flooded h = Diked/impounded
EM = Emergent F = Semi-permanently flooded f = farmed
AQ = Aquatic bed A = Temporarily flooded US = Unconsolidated hore
C = Seasonally Flooded
APPENDIX III
WETLAND DELINEATION DATA FORMS
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
ATTACHMENT VIII
PRELIMINARY IMPACTS TO WOUS MAP
b b b b b b
b b b b b b
b b b b b b
b b b b b b
b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b b b b b b b b b b
b b b b b
b b b b b
b b b b b
b b b
b b b
b b b
b b b
b b b
b b b
b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b b b b b b b b b b b b
b b b b b
b b b b b
b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b b b b b b b b b b b
b b b
b b b
!A
!A
!A
!A
!A
!A
IsolatedWetland 2±0.01 ac
SCCW 2±0.02 ac
SCCW 5±0.08 ac
SCCW 4±0.31 ac
Wetland 4±0.05 ac
Wetland 3±0.23 ac
SCCW 3±2.17 ac
IsolatedWetland 1±0.21 ac
SCCW 6±2.14 ac
JD Channel D
JD Channel C
JD Channel A
JD Channel B
Wetland 5±0.12 ac
IsolatedWetland 4±0.19 ac
IsolatedWetland 3±0.03 ac
SCCW Impact±0.31 ac±781 ft
JD Channel Impact±0.65 ac
±503 ft
SCCW Impact±0.19 ac
±189 ft
SCCW Impact±0.03 ac
±70 ft
SCCW Impact±0.001 ac
±8 ft
Wetland Impact±0.12 ac
JD Channel Impact±0.06 ac±99 ft
SCCW Impact±0.02 ac±80 ft
SCCW Impact±0.01 ac
±57 ft
SCCW Impact±0.02 ac±21 ft
Poco Rd
Arroya Ln
Vo
llm
er
Rd
SP 1
SP 2
SP 3
SP 4
SP 5
SP 6
Date: 12/5/2017
CORE Project #: 16-059
Trails at Timber RidgeWetland Location MapEl Paso County, Colorado
q
0 500 1,000Feet
Project Boundary
NHD Watercourse
NHD Waterbody
!A Sample Point
JD Channel (OHWM)
b b b b b
b b b b b
b b b b b
Stream Channel Containing Wetlands
b b b b b
b b b b bWetland
Pond
Isolated Wetland
Proposed Impacts
Proposed Road
Proposed Lot
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
ATTACHMENT IX
DETERMINATION OF DEPARTMENT OF THE ARMY PERMIT REQUIREMENTS FOR – THE RETREAT AT TIMBER RIDGE
RESIDENTIAL DEVELOPMENT
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
ATTACHMENT X
CLASS I CULTURAL RESOURCES REVIEW
Cultural Resource Existing Data Review and Assessment for The Timber Ridge Development Project, El Paso County, Colorado
By: Colin R. Ferriman, MA RPA Cultural Resource Analysts, Inc.
Project Description
Cultural Resource Analysts, Inc. (CRA), was contracted by Core Consultants to conduct a records review for cultural resources in regards to the proposed Timber Ridge Development Project. This project area covers approximately 306 acres of private land within Sections 21, 22, 27, and 28 of Township 12S, Range 65W. It is located in El Paso County immediately northeast of Colorado Springs, Colorado (Figure 1).
For this records review the study area was defined as all areas within and around the project area out to 1 mi. The purpose of this study is to provide an assessment of known cultural resources and previous investigations within this study area.
Records Review and Assessment of Cultural Resources
An official file search was conducted using the records housed with the Colorado Historical Society’s Office of Archaeology and Historic Preservation (OAHP). The file search results listed one previous investigation near the study area that occurred in 2002 (OAHP 2017). This investigation was conducted in regards to a pipeline project that traversed the western halves of Sections 21 and 28. None of the current project area has been subjected to cultural resource inventory. Furthermore, there are no previously identified cultural resource sites within or near the current project area.
In addition to the official file search the background research for this project included the examination of the 1886 General Land Office (GLO) plat map (BLM 2017a), as well as a search of the GLO land patent records (BLM 2017b). The plat map does not depict any trails, roads, or towns within or near the project area. (Figure 2). The search of the GLO patent records was conducted to identify the origins of historic occupation in the study area and provide some indications as to the likelihood of encountering historic sites within the project area. Twenty-three patents were issued within the study area between 1870 and 1890. Seventeen of the private individual patents were issued under the 1820 Cash Sale Act. The 1820 Cash Sale Act required settlers to pay in cash at the time of land purchase, but it lowered the number of required acres to purchase from 160 to 80 and the price per acre was set at $1.25 (Clark 2011:376). Five patents were issued to military veterans (and their heirs) under the Scrip Warrant Act of 1855. Prior to the Civil War the United States Government issued bounty land warrants as a way to encourage men to volunteer for military service and as a way to reward veterans (National Archives Record Administration 2010). These men served in militia companies that were likely associated with the numerous conflicts that occurred throughout the 1850s between the United States Government and various Native American tribes. One patent was issued under the Morrill Act (1862 State Grant Agri College). This act provided each state with 30,000 acres of Federal Land for each member of their congressional delegation. The land was then sold by the states in order to fund public colleges that focused on agriculture and mechanical arts. Many of the Nation’s early public colleges were initially funded throughout this act (Library of Congress 2015).
1
12S 65W
Falcon NW
Black Forest
Copyright:© 2013 National Geographic Society, i-cubed
For Official Use Only: Disclosure of site locations prohibited (43 CFR 7.18)
Coordinate System:UTM NAD 83 Zone13N
Figure 1: Project Location Map at 1:24,000 scale
±1 inch = 2,000 feet
1:24,000
1 inch = 610 meters
Timber Ridge Development
0 4,400Feet
0 1,400Meters
Study Area
Previous Inventory
Private
State
Quadrangle Boundary
Township
CRF
Y17C001
3-28-2017
Timber Ridge Development
Figure 2. 1886 GLO plat map overview, T12S, R65W. Adapted from BLM 2017a.
Table 1. GLO Land Patents within and around the Study Area
Twn/Rng Sec. Patentee Associated Military Unit or College Date Accession
Number Authority
12S/65W 21
George H. Bend Thomas J. Wood
Francis H. Jackson William Van Marter Benjamin Stalvey
Captain Tornlisons Company Georgia Militia 11/15/1871 MW0441447 Scrip Warrant Act of 1855
12S/65W 21
George H. Bend Thomas J. Wood
Francis H. Jackson Argalus M. Wright
Patty Wright Abram Wright
Captain Babock Company New York
Militia 11/15/1871 MW0441459 Scrip Warrant Act of 1855
12S/65W 21 George H. Bend Thomas J. Wood
Francis H. Jackson Not Applicable 11/10/1870 CO0220107 1820 Sale Cash Entry Act
3
Table 1. Continued
Twn/Rng Sec. Patentee Associated Military Unit or College Date Accession
Number Authority
12S/65W 21 George H. Bend Thomas J. Wood
Francis H. Jackson Not Applicable 11/10/1870 CO0220115 1820 Sale Cash Entry Act
12S/65W 21 Cyrus H. McLaughlin Not Applicable 11/10/1870 CO0220084 1820 Sale Cash Entry Act
12S/65W 22
George H. Bend Thomas J. Wood
Francis H. Jackson William Van Marter
Hannah Corby John J. Corby
Captain Adams Company New York
Militia 11/15/1871 MW0441441 Scrip Warrant Act of 1855
12S/65W 22
George H. Bend Thomas J. Wood
Francis H. Jackson Argalus M. Wright
Patty Wright Abram Wright
Captain Babock Company New York
Militia 11/15/1871 MW0441459 Scrip Warrant Act of 1855
12S/65W 22 Cyrus H. McLaughlin Not Applicable 11/10/1870 CO0220084 1820 Sale Cash Entry Act
12S/65W 22 William J. Palmer North Carolina State University 7/1/1870 AGS0319068 1862 State Grant Agri College
12S/65W 27/28
George H. Bend Thomas J. Wood
Francis H. Jackson Mary V. Gilbert
William H. Van Marter Sylvester Gilbert
Captain Hitchcocks Company New York
Militia 11/15/1871 MW0441444 Scrip Warrant Act of 1855
12S/65W 27/28 Benjamin F. Crowell Not Applicable 11/15/1872 CO1090167 1820 Sale Cash Entry Act 12S/65W 27 Francis B. Hill Not Applicable 12/5/1884 CO1140087 1820 Sale Cash Entry Act 12S/65W 27 Francis B. Hill Not Applicable 5/25/1885 CO1140223 1820 Sale Cash Entry Act 12S/65W 27 Francis B. Hill Not Applicable 6/12/1885 CO1140262 1820 Sale Cash Entry Act 12S/65W 27 Francis B. Hill Not Applicable 3/1/1886 CO1140415 1820 Sale Cash Entry Act 12S/65W 27 Francis B. Hill Not Applicable 10/18/1886 CO1140493 1820 Sale Cash Entry Act 12S/65W 27 Francis B. Hill Not Applicable 10/18/1886 CO1150029 1820 Sale Cash Entry Act 12S/65W 28 Francis B. Hill Not Applicable 3/1/1886 CO1140386 1820 Sale Cash Entry Act 12S/65W 28 Francis B. Hill Not Applicable 3/1/1886 CO1140414 1820 Sale Cash Entry Act 12S/65W 28 Francis B. Hill Not Applicable 10/18/1886 CO1150029 1820 Sale Cash Entry Act 12S/65W 28 Francis B. Hill Not Applicable 3/5/1890 CO1170177 1820 Sale Cash Entry Act 12S/65W 28 Patrick H. McNeill Not Applicable 12/5/1884 CO1140151 1820 Sale Cash Entry Act 12/S/65W 28 Patrick H. McNeill Not Applicable 12/5/1884 CO1140188 1820 Sale Cash Entry Act
Cultural Resource Recommendations
Based on the results of the OAHP file search and the desktop data review, it appears that the proposed project area has not been subjected to adequate cultural resource inventory. Subsequently, it is possible that unidentified cultural resources could be impacted by the proposed project.
Therefore, it is recommended prior to ground disturbing activities associated with this project that an intensive cultural resource inventory be conducted. The purpose of this inventory is to identify and to evaluate any undiscovered cultural resources for inclusion in the National Register of Historic Places.
4
References Cited
Bureau of Land Management 2017a “Survey Plats and Field Notes.” General Land Office Records Automation Web Site. United States Department of the Interior, Bureau of Land Management. Electronic database, http://glorecords.blm.gov, accessed March 29, 2017. 2017b “Search Land Patents.” General Land Office Records Automation Web Site. United States Department of the Interior, Bureau of Land Management. Electronic database, http://glorecords.blm.gov, accessed March 29, 2017.
Clark, Cynthia 2011 The American Economy A Historical Encyclopedia, Revised Edition. ABC-Clio, Denver Colorado. Library of Congress 2015 Merrill Act. Electronic document, https://www.loc.gov/rr/program/bib/ourdocs/Morrill.html, accessed March 29, 2017. National Archives and Records Administration 2010 Bounty Land Warrants for Military Service, 1775-1855. Electronic document, www.archives.gov/files/research/military/bounty-land-1775-1855.pdf, accessed March 29, 2017. OAHP 2017 Timber Ridge Development; Y17C001 File Search No. 20093. Colorado Historical Society’s Office of Archaeology and Historic Preservation. Denver, Colorado.
5
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
ATTACHMENT XI
NOXIOUS WEED MANAGEMENT PLAN
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
NOXIOUS WEED MANAGEMENT PLAN
THE RETREAT AT TIMBER RIDGE
RESIDENTIAL DEVELOPMENT PROJECT
El Paso County, CO
Project No. 16-059
PREPARED FOR:
Arroya Investments LLC
P.O. Box 50223
Colorado Springs, CO 80949
Phone: 719-491-3150
Contact: Peter Martz
PREPARED BY:
CORE Consultants, Inc.
1950 W. Littleton Boulevard, Suite 109
Littleton, CO 80120
Phone: 303-703-4444
Contact: Tina Brazil
CORE Project Number: 16-059
July 7, 2017
Noxious Weed Management Plan
Retreat at Timber Ridge Residential Development Project
July 7, 2017
Page ii of iii
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
TABLE OF CONTENTS
EXECUTIVE SUMMARY ................................................................................................. III
1.0 INTRODUCTION ....................................................................................................... 1
2.0 NOXIOUS WEED MANAGEMENT .......................................................................... 1
3.0 NOXIOUS WEED MANAGEMENT PLAN .............................................................. 2
3.1 Purpose and Goals ................................................................................................................................................ 2
3.2 Regulated Species .................................................................................................................................................. 3
3.3 Pre-Construction .................................................................................................................................................. 3
3.4 Construction .......................................................................................................................................................... 3
3.5 Post-Construction ................................................................................................................................................. 4
4.0 CONCLUSIONS AND RECOMMENDATIONS ...................................................... 4
REFERENCES .................................................................................................................... 5
APPENDICES APPENDIX I: SITE LOCATION MAP
APPENDIX II: COLORADO STATE NOXIOUS WEED LIST
Noxious Weed Management Plan
Retreat at Timber Ridge Residential Development Project
July 7, 2017
Page iii of iii
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
EXECUTIVE SUMMARY
CORE Consultants, Inc. (CORE) was retained by Arroya Investments, LLC (Client) to prepare a Noxious
Weed Management Plan (Plan) for the proposed Retreat at Timber Ridge Residential Development Project
(Project) in El Paso County, Colorado. The Project is located adjacent to and surrounding the intersection
of Vollmer Road and Arroya Lane and encompasses approximately 264 acres on Sections 17, 21, 22, and
28 in Township 12 South, Range 65 West. The Project would consist of the construction of single family
residential homes, permanent access roads, and associated facilities.
This Plan is a Project-specific document that has been designed to set forth Project level regulations to
prevent and control the spread of noxious weeds within the Project and vicinity. Noxious weeds are
defined as those non-native plants that aggressively invade and are detrimental to native vegetation
communities and ecosystems. The Colorado State Noxious Weed Act (Colorado Revised Statute 35-5.5-103)
developed a list of plants considered noxious in the state of Colorado that should be targeted for control
by various methods dependent on list category (A, B, C). El Paso County Environmental Services
requested submittal of a Project-specific Noxious Weed Management Plan since the Project is located
adjacent to an area known to contain noxious weed populations. The Plan should tier to the requirements
set forth by the El Paso County (County) Noxious Weed Management Plan (2003, updated 2014) which
contains guidelines for control and treatment of noxious weeds found in the County. The County requires
that commercial or industrial projects that include ground disturbing activities submit a project-specific
noxious weed management plan. This Plan provides methods to prevent and control the spread of noxious
weeds at pre-construction, construction, and post-construction phases of the Project.
Noxious Weed Management Plan
Retreat at Timber Ridge Residential Development Project
July 7, 2017
Page 1 of 5
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
1.0 INTRODUCTION
Arroya Investments, LLC (Client) retained CORE Consultants, Inc. (CORE) to prepare a Noxious Weed
Management Plan for the proposed Retreat at Timber Ridge Residential Development Project (Project)
located in El Paso County, Colorado. The Project is located adjacent to and surrounding the intersection
of Vollmer Road and Arroya Lane and is on the U.S. Geological Survey (USGS) Falcon North West 7.5-
minute quadrangle (Appendix I: Site Location Map).
The Project lies within the Fountain watershed, referenced as 8-digit Hydrologic Unit Code (HUC)
11020003. The main channel of Sand Creek and multiple unnamed tributaries drain the Project in a
southerly direction. Land use in the region is typified by rangeland grazing with increasing urban and
residential development. Topography of the Project consists of rolling foothill grasslands within the
southern portion of the Project transitioning into pine-oak woodlands within the northern portion of the
Project (Chapman et al. 2006). Scattered, shallow ridges and dense stands of ponderosa pine (Pinus
ponderosa) are located across the northern portion of the Project and coincide with the southern
boundary of Black Forest.
Dominant species within the foothills grasslands include little bluestem (Schizachyrium scoparium), big
bluestem (Andropogon gerardii), switch grass (Panicum virgatum), and yellow Indiangrass (Sorghastrum nutans).
Scattered pine-oak communities are located across higher elevation areas of the foothills grasslands.
Ponderosa pine and Gambel oak (Quercus gambelii) dominate the canopy and understory of the pine-oak
woodlands. Mountain mahogany (Cercocarpus montanus), skunkbush (Rhus trilobata), western serviceberry
(Amelanchier alnifolia), and chokecherry (Prunus virginiana) are also found scattered throughout the
understory.
2.0 NOXIOUS WEED MANAGEMENT
The spread of invasive species roughly mirrors the rise in human travel and commerce (Mack et al., 2000;
Sheley et al., 1996). Many noxious weeds have been identified as aggressive, weather resistant escaped
ornamentals from residential landscapes (Westbrooks, 1998). The Federal Noxious Weed Act (7 U.S.C. 2801
et seq.; 88 Stat. 2148) was enacted in 1975 in an effort to halt the spread of noxious weeds across the
country. Following guidelines set forth by the Federal Noxious Weed Act, Colorado passed the Colorado
Noxious Weed Act (Act) (C.R.S. 35-5.5-103) in 1990. The Act identified noxious weeds particular to the
landscape of Colorado. The Act defines noxious weeds as any non-native plant that:
• Aggressively invades or is detrimental to economic crops or native plant communities;
• Is poisonous to livestock;
• Is a carrier of detrimental insects, diseases, or parasites;
• Is detrimental, either by direct or indirect effects, to the environmentally sound management of
natural or agricultural ecosystems.
The Act was amended in 2002 to require counties to establish individual management plans relevant to
local municipalities. El Paso County developed the El Paso County Noxious Weed Management Plan in 2003
Noxious Weed Management Plan
Retreat at Timber Ridge Residential Development Project
July 7, 2017
Page 2 of 5
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
(updated 2014) to identify county-level noxious weed management practices that would preserve the
economic and environmental value of County lands (EPC, 2014). The Town of Monument tiers to the El
Paso County requirements for noxious weed management practices.
Disturbed areas are vulnerable to infestation from noxious weeds due to the aggressive nature by which
noxious weeds can spread. Construction activities including clearing, grading, and excavation promote the
establishment of noxious weed species before native vegetation can reestablish within the cleared area.
As such, the EPC Noxious Weed Management Plan requires integrated management plans for any activities
requiring dirt moving activities within the County (EPC, 2014). Project-specific integrated management
plans should include methods to prevent, control, and monitor the spread of noxious weeds and should
take into account the multiple methods by which noxious weeds germinate. Annuals typically reproduce
through seed which can easily attach to equipment during construction activities. Perennials often
propagate through an extensive root system. Ground disturbing activities have the potential to
redistribute root sections that could quickly propagate in other areas. Because of the multiple methods
by which noxious weeds spread and propagate, integrated management plans should outline education
and native revegetation methods in addition to chemical control methods (EPC, 2014).
3.0 NOXIOUS WEED MANAGEMENT PLAN
3.1 Purpose and Goals Construction of the Project would occur over six to eight months. Upon completion of construction,
the development would be utilized as a residential space with open trails as proposed. It is anticipated
that ground disturbance would occur throughout much of the site for development of access roads
and residential lots. As such, this integrated management plan includes pre-construction,
construction, and maintenance methods to prevent, control, and monitor the spread of identified
noxious weed populations within the Project. It would become the responsibility of the Home
Owner’s Association (HOA) to manage and treat persistent noxious weed populations within the
Project, if any. However, it is assumed that regular landscaping of public areas on the site would
include noxious weed control. Integrated management methods should include the following:
• Surveys to inventory and map established noxious weed populations;
• Sharing of data with the County to aid in County level inventory;
• Chemical treatment of all identified noxious weed populations;
• Periodic post-construction treatment as needed and as determined by the property management
entity.
Management methods identified within this Plan will comply with Chapter 6: General Development
Standards of the EPC Land Development Code (EPC, 2015), the EPC Noxious Weed Management Plan
(EPC, 2014) and the Act (Colorado Revised Statutes 35-5.5-103). Biological control methods are not
included due to the prohibition of their use on plants targeted for eradication (Colorado Weed
Management Association, 2015). Noxious weed species targeted would be those identified in the
Act, with special consideration for those species listed in the EPC Noxious Weeds and Control Methods
(EPC, 2008).
Noxious Weed Management Plan
Retreat at Timber Ridge Residential Development Project
July 7, 2017
Page 3 of 5
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
3.2 Regulated Species The Act identifies three levels of priority for control of noxious weeds throughout the State of
Colorado (State). The Colorado Weed Management Association (CWMA) maintains an updated list
of noxious weeds known to occur in the State. CWMA also maintains a “watch list” of noxious
weeds that occur in proximity to State borders and/or those species with a distribution that is not
yet understood. Refer to Appendix II: Colorado State Noxious Weed List (CWMA, 2015). List A noxious weeds are those species targeted for eradication. List A noxious weed populations are
typically isolated in nature or rare throughout much of the State (Colorado Revised Statutes 35-5.5-
103). Eradication and reporting of List A populations is required by law (Colorado Department of
Agriculture [CDA], 2006). List B species are discretely distributed throughout the State and must be
eradicated, contained, or suppressed (Colorado Revised Statutes 35-5.5-103). The County requires
control of all List B noxious weed populations located within the Project area (EPC, 2014). List C
noxious weed populations are widespread and well established. The County requires control of List
C species through education of the public and/or chemical control (Appendix II).
3.3 Pre-Construction Pre-construction noxious weed management protocols would include prevention and treatment.
Prevention and treatment would be accomplished through surveys of construction easements,
followed by primary chemical treatment.
Noxious weed surveys would be conducted within all construction easements prior to construction;
i.e., prior to any ground disturbing activities. Surveyors would use GPS units to collect population
data. Data collected for List C populations would include species and coordinates of population. Data
collected for List A and B populations would include species, coordinates for the approximate center
of each identified population, approximate radius of infestation, and approximate density (measured
in percent coverage within the estimated extent of a population). The County would receive a map
of identified noxious weed populations within the Project. Should surveyors locate List A species,
specific data collected would be sent to the County. Treatment type would be selected depending
on the priority rank of the noxious weed species (List A, B, C), and the location and density of the
infestation. Chemical treatment would include herbicide application. The suggested chemical
treatment protocol is described below.
List A species must be eradicated by law (USDA, 2006). Should surveyors identify List A species, a
plant sample would be collected for positive identification through the EPC Environmental Division.
Upon positive confirmation of a List A species, hand pulling of the population would be performed
to remove the mechanism for creation of a seed-bank. Chemical treatment would be applied to the
area and would be selected in compliance with the EPC Noxious Weeds and Control Methods (EPC,
2008). List B and List C species would be chemically treated with an herbicide selected in compliance
with the EPC Noxious Weeds and Control Methods. Herbicide selection may vary depending upon time
of year and life cycle of the plant. All herbicide application would occur a minimum of two weeks
prior to scheduled ground disturbing activities. The herbicide applicator would treat noxious weed
populations with County recommended chemicals (Appendix II).
3.4 Construction Construction phase noxious weed management protocols would include prevention and
maintenance. Contractors would prevent the spread of noxious weeds through the use of clean
equipment and through treatment of all noxious weed populations prior to ground disturbing
Noxious Weed Management Plan
Retreat at Timber Ridge Residential Development Project
July 7, 2017
Page 4 of 5
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
activities. Heavy equipment used on the site would be washed and sprayed before mobilization on
the Project. Doing so would ensure that soils and seeds are not transported from other sites.
Noxious weed treatment would occur to areas slated for ground disturbance prior to construction.
Doing so would ensure that active noxious weed populations would become inactive prior to
construction.
It is anticipated that top-soil could be salvaged from the site. Salvaged top-soil piles would be
maintained and protected from erosion and/or noxious weed establishment during construction
through Best Management Practices (BMPs) identified in the Project Grading, Erosion, and Sediment
Control (GESC) Plan. Native-site top-soil would be used during reestablishment of native seed mixes
post-construction.
3.5 Post-Construction Post-construction noxious weed management protocols would be limited to maintenance treatment,
as needed. It is anticipated that the HOA would monitor and treat noxious weed populations on a
seasonal basis. Typically, an HOA would contract a licensed and certified herbicide applicator to
conduct yearly treatments for noxious weeds throughout the development.
4.0 CONCLUSIONS AND RECOMMENDATIONS
This Project Noxious Weed Management Plan was written to comply with guidelines in the Colorado
Noxious Weed Act (Colorado Revised Statutes 35-5.5-103) and the EPC Noxious Weed Management
Plan. CORE recommends that the Client survey for and treat any noxious weed populations located on
the Project. The property management entity would be responsible for maintaining a weed-free property
following construction. Typically, chemical treatment would be applied between late spring and early fall
depending on the recommended treatment protocols for each noxious weed species.
Should you have any questions regarding this or any other matter, please feel free to contact our office at
(303) 703-4444.
Sincerely,
CORE Consultants, Inc.
Tina Brazil Chris Haas
Environmental Consultant Vice President
Noxious Weed Management Plan
Retreat at Timber Ridge Residential Development Project
July 7, 2017
Page 5 of 5
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
REFERENCES
Colorado Department of Agriculture. (2006). 8 CCR 1206 -2 – Rules Pertaining to the
Administration and Enforcement of the Colorado Noxious Weed Act.
Colorado Weed Management Association. (CWMA). 2015. Colorado State Noxious Weed
List
EPC. El Paso County Noxious Weeds and Control Methods. (2008).
___. El Paso County Noxious Weed Management Plan. (2014).
___. Land Development Code. (2015).
Mack, R. N., Simberloff, D., Mark Lonsdale, W., Evans, H., Clout, M., & Bazzaz, F. A. (2000).
Biotic invasions: causes, epidemiology, global consequences, and control. Ecological
applications, 10(3), 689-710.
Sheley, R., Manoukian, M., & Marks, G. (1996). Preventing Noxious Weed Invasion.
Rangelands,18, 100-101.
State of Colorado. (2003). Colorado Revised Statutes, Title 35 Agriculture, Article 5.5
Colorado Noxious Weed Act.
U.S. Department of Agriculture (USDA). 2001. Effective Aerial Reseeding Methods: Market
Search Report.
Westbrooks, R. G. (1998). Invasive plants: changing the landscape of America.US
Government Documents (Utah Regional Depository), 490.
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
APPENDIX I
SITE LOCATION MAP
Retreat at Timber RidgeSite Location Map
El Paso County, Colorado
0 2,000 4,000Feet
q
Project Boundary
UT
KS
NM
NE
WY
OKAZ
Project Area
Colorado Vicinity
Reference:USGS 7.5 Minute
Topographic QuadrangleFalcon NW, CO Quad
Date: 12/5/2017CORE Project #: 16-059
CORE Consultants, Inc. | 1950 W. Littleton Boulevard, Suite 109 | Littleton, CO 80120 | 303.703.4444 | www.CoreCivil.com
APPENDIX II
COLORADO STATE NOXIOUS WEED LIST
CORE Consultants Inc.
1950 W Littleton Blvd Suite 109 | Littleton CO 80120
303.703.4444
COMMON NAME SCIENTIFIC NAME LIST
African rue Peganum harmala A
camelthorn Alhagi pseudalhagi A
Cypress spurge Euphorbia cyparissias A
Dyer's woad Isatis tinctoria A
elongated mustard Brassica elongata A
flowering rush Butomus umbellatus A
giant reed Arubdo donax A
giant salvinia Salvinia molesta A
hairy willow-herb Epilobium hirsutum A
hydrilla Hydrilla verticillata A
Japanese, giant and bohemian knotweed
Polygonum cuspidatum, P. sachalinense and P. bohemicum
A
meadow knapweed Centaurea pratensis A
Mediterranean sage Salvia aethiopis A
medusahead Taeniatherum caput-medusae A
myrtle spurge Euphorbia myrsinites A
orange hawkweed Hieracium aurantiacum A
parrot feather Myriophyllum aquaticum A
purple loosestrife Lythrum salicaria A
rush skeletonweed Chondrilla juncea A
squarrose knapweed Centaurea virgata A
tansy ragwort Senecio jacobaea A
yellow starthistle Centaurea solstitialis A
absinth wormwood Artemesia absinthium B
black henbane Hyoscyamus niger B
bouncingbet Saponaria officinalis B
bull thistle Cirsium vulgare B
Canada thistle Cirsium arvense B
Chinese clematis Clematis orientalis B
common tansy Tanacetum vulgare B
common teasel Dipsacus fullonum B
corn chamomile Anthemis arvensis B
cutleaf teasel Dipsacus laciniatus B
dalmatian toadflax (broad leaved) Linaria dalmatica B
dalmatian toadflax (narrow leaved) Linaria genistifolia B
dame's rocket Hesperis matronalis B
CORE Consultants Inc.
1950 W Littleton Blvd Suite 109 | Littleton CO 80120
303.703.4444
diffuse knapweed Centaurea diffusa B
Eurasian watermilfoil Myriophyllum spicatum B
hoary cress Cardaria draba B
houndstongue Cynoglossum officinale B
jointed goatgrass Aegilops cylindrica B
leafy spurge Euphorbia esula B
mayweed chamomile Anthemis cotula B
moth mullein Verbascum blattaria B
musk thistle Carduus nutans B
oxeye daisy Leucanthemum vulgare B
perennial pepperweed Lepidium latifolium B
plumeless thistle Carduus acanthoides B
Russian knapweed Acroptilon repens B
Russian-olive Eleagnus angustifolia B
salt cedar Tamarix chinensis, T. parviflora, and T. ramosissima
B
scentless chamomile Tripleurospermum perforatum B
scotch thistle Onopordum acanthium and O. tauricum B
sulfur cinquefoil Potentilla recta B
wild caraway Carum carvi B
yellow nutsedge Cyperus esculentus B
yellow toadflax Linaria vulgaris B
bulbous bluegrass Poa bulbosa C
chicory Cichorium intybus C
common burdock Arctium minus C
common mullein Verbascum thapsus C
common St. Johnswort Hypericum perforatum C
downy brome Bromus tectorum C
field bindweed Convolvulus arvensis C
halogeton Halogeton glomeratus C
johnsongrass Sorghum halepense C
perennial sowthistle Sonchus arvensis C
poison hemlock Conium maculatum C
puncturevine Tribulus terrestris C
quackgrass Elymus repens C
redstem filaree Erodium cicutarium C
velvetleaf Abutilon theophrasti C
wild proso millet Panicum miliaceum C
CORE Consultants Inc.
1950 W Littleton Blvd Suite 109 | Littleton CO 80120
303.703.4444
Asian mustard Brassica tournefortii WATCH
baby's breath Gypsophila paniculata WATCH
bathurst burr Xanthium spinosum WATCH
Brazilian egeria Egeria densa WATCH
common bugloss Anchusa officinalis WATCH
common reed Phragmites australis WATCH
garden loosestrife Lysimachia vulgaris WATCH
garlic mustard Alliaria petiolata WATCH
Himalayan blackberry Rubus armeniacus WATCH
Japanese blood grass Imperata cylindrica WATCH
meadow hawkweed Hieracium caespitosum WATCH
onionweed Asphodelus fistulosus WATCH
purple pampas grass Cortaderia jubata WATCH
scotch broom Cytisus scoparius WATCH
sericea lespedeza Lespedeza cuneata WATCH
Swainson pea Sphaerophysa salsula WATCH
Syrian beancaper Zygophyllum fabago WATCH
water hyacinth Eichhornia crassipes WATCH
water lettuce Pistia stratiotes WATCH
white bryony Bryonia alba WATCH
woolly distaff thistle Carthamus lanatus WATCH
yellow flag iris Iris pseudacorus WATCH
yellow floatingheart Nymphoides peltata WATCH
yellowtuft Alyssum, A. corsicum WATCH